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Laws regarding incest (i.e. sexual activity between family members or close relatives) vary considerably between jurisdictions, and depend on the type of sexual activity and the nature of the family relationship of the parties involved, as well as the age and sex of the parties. Besides legal prohibitions, at least some forms of incest are also socially taboo or frowned upon in most cultures around the world.

Incest laws may involve restrictions on marriage, which also vary between jurisdictions. When incest involves an adult and a child (under the age of consent) it is considered to be a form of child sexual abuse.^[1][2]

Laws regarding incest are sometimes expressed in terms of degrees of relationship. The degree of relationship is calculated by adding the number of generations back to a closest common ancestor of each individual. Consanguinity (but not affinity) relationships may be summarized as follows:

Most laws regarding prohibited degree of kinship concern relations of r = 25% or higher, while most permit unions of individuals with r = 12.5% or lower. In 24 states of the United States, cousin marriages are prohibited. Also, most laws make no provision for the rare case of marriage between double first cousins. Incest laws may also include prohibitions of unions between biologically unrelated individuals if there is a close legal relationship, such as adoption or step relations.

Country	Incest between consenting adults	Prohibited relationships	Penalties
Afghanistan	Illegal	Lineal ancestors and descendants Full and half-siblings	Death
Albania	Illegal[6]
Algeria	Illegal	Relatives in the descending or ascending line Full, consanguineous or uterine brothers and sisters A person and the child of one of his full, consanguineous or uterine brothers or sisters or with a descendant thereof The mother or the father and the husband or the wife, the widower or the widow of his child or of another of his descendants Stepmother or stepfather and the descendant of the other spouse Persons one of whom is the wife or husband of a brother or sister	The penalty is ten (10) to twenty (20) years of imprisonment in the 1st and 2nd cases, five (5) years to ten (10) years of imprisonment in the 3rd, 4th and 5th cases and from two (2) years to five (5) years imprisonment in the 6th case[7]
Angola	Legal
Antigua and Barbuda	Legal
Argentina	Legal
Armenia	Illegal
Australia	Illegal	Varies by state	Varies by state
Austria	legal (for same-sex couples) / Illegal (for opposite-sex couples)	Lineal ancestors and descendants Full siblings and half siblings	Up to 3 years in prison or fine
Azerbaijan	Illegal
Bahamas	Legal
Bangladesh	Illegal	Lineal ancestors and descendants Full and half-siblings	Life imprisonment
Barbados	Legal
Belarus	Legal
Belgium	Legal
Belize	Legal
Benin	Legal
Bhutan	Legal
Bolivia	Legal
Bosnia and Herzegovina	Illegal
Botswana	Legal
Brazil	Legal
Brunei	Illegal	Lineal ancestors and descendants Full and half-siblings	Death
Bulgaria	Illegal	Parent, grandparent, child, grandchild Brother, sister, half-brother, half-sister Uncle or aunt (by blood) Nephew or niece First cousin Grandaunt (by blood), granduncle (by blood), grandniece, grandnephew	Up to seven years in prison
Burkina Faso	Legal
Cabo Verde	Legal
Cambodia	Legal
Canada	Illegal	Child/parent or grandchild/grandparent Full and half-siblings	Up to 14 years in prison
Central African Republic	Legal
Chile	Illegal	Consanguineal ancestors and descendants Consanguineal siblings	From 61 days up to 3 years and 1 day in prison[8]
China	Legal
Colombia	Illegal[9]	Consanguineal and adopted ancestors and descendants Consanguineal and adopted siblings	From 16 up to 72 months in prison
Costa Rica	Legal
Croatia	Illegal	Linear ancestors and descendants Full and half-siblings	Up to one year in prison
Cuba	Illegal
Czech Republic	Illegal	Lineal ancestors and descendants Siblings Related by blood or adoption	Up to three years in prison
Democratic Republic of the Congo	Legal
Denmark	Illegal	Lineal ancestors and descendants Full siblings	Up to six years in prison (direct line) Up to two years in prison (siblings)
Dominica	Legal
Dominican Republic	Legal
East Timor	Legal
Ecuador	Legal
El Salvador	Legal
Eritrea	Illegal	Grandparent—grandchild or parent—child Brother or half brother, sister or half-sister Same-sex relations are always prohibited	From one to three years in prison[10]
Estonia	Illegal	Grandparent—grandchild or parent—child	From two to eight years in prison[11]
Eswatini	Illegal	Offspring, sibling, parent or grandparent	25 years, if aged 14 years or less 20 years, if aged 14-18 years 10 years and E50.000, if 18 years or more 4 years and E20.000, if 18 years or more with consent[12]
Ethiopia	Illegal	Blood relatives whose marriage is prohibited by respective law Same-sex relations are always prohibited	From three months to three years in prison[13]
Federated States of Micronesia	Legal[14]
Fiji	Illegal	"Carnal knowledge of" (sexual intercourse with) parent, grandparent or sibling.	Imprisonment for 20 years.[15]
France	Legal
Gabon	Legal
Georgia	Illegal	Lineal ancestors and descendants Full and half-siblings	Up to two years in prison
Germany	Legal (for same-sex couples) / Illegal (for opposite-sex couples)	Lineal ancestors and descendants Full and half-siblings	Up to three years in prison or fine (not punished if both are minors)
Ghana	Illegal	Lineal ancestors and descendants Full and half-siblings	Prison sentence
Greece	Illegal	Lineal ancestors and descendants Full and half-siblings Uncle or aunt (by blood) Nephew or niece	More than 10 years in prison for the ascending relative if the descending relative is under 15 years old, imprisonment if 15 but not 18 years old, and up to two years in prison if 18 years and older Up to two years in prison if siblings or half-siblings or for the descending relative
Grenada	Illegal	Daughter/son, granddaughter/grandson, sister/brother, aunt/uncle (by blood) or niece/nephew[16]
Guatemala	Legal
Guinea-Bissau	Legal
Guyana	Legal (for opposite-sex couples) / Illegal (for same-sex couples)		For same-sex couples: Life imprisonment
Haiti	Legal
Honduras	Legal
Hong Kong	Legal (for same-sex couples) / Illegal (for opposite-sex couples)	Granddaughter, daughter, sister or mother (male) Grandfather, father, brother or son (female)	Life imprisonment if under 13 20 years imprisonment if between 13 and 16 14 years imprisonment in other cases Consent of the Secretary of Justice is required for a prosecution[17]
Hungary	Illegal	Lineal ancestors and descendants Sibling	Imprisonment not exceeding three years (for relatives in direct line) imprisonment not exceeding two years (for siblings)[18]
Iceland	Illegal	Lineal ancestors and descendants Full and half-siblings	Up to eight years in prison for ascending relative Up to 12 years if descending relative is between 15 and 17 years old Up to four years in prison for siblings
India	Legal
Indonesia	Illegal	Lineal ancestors and descendants Full and half-siblings	Eight years imprisonment and 100 lashes
Ireland	Legal (same-sex couples) / Illegal (opposite-sex couples)	Granddaughter, daughter, mother, sister or half-sister (male) Grandfather, father, son, brother or half-brother (female)	Up to 10 years in prison (male and female)
Iran	Illegal	Lineal ancestors and descendants Full and half-siblings	Death
Israel	Legal (if aged 21 or older) / Illegal (if under the age of 21)
Italy	/ Legal (unless it provokes public scandal)		From two to eight years in prison
Ivory Coast	Legal
Jamaica	Legal (for opposite-sex couples) / Illegal (for same-sex couples)		For same-sex couples: Ten years imprisonment with hard labour
Japan	Legal
Kazakhstan	Illegal
Kenya	Illegal	"Indecent" acts or acts causing penetration with: daughter, granddaughter, sister, mother, niece, aunt or grandmother (if male) son, father, grandson, grand father, brother, nephew or uncle (if female).	Imprisonment for a term of not less than ten years.[19]
Kiribati	Illegal	Sexual intercourse with: granddaughter, daughter, sister or mother (if male) grandfather, father, brother or son (if female from the age of 15)	Imprisonment for 7 years.[20]
Kosovo	Legal
Kyrgyzstan	Legal
Laos	Illegal	Biological parent, parent by adoption, step-parent, grandparent, parent in law, biological child, adopted child, step-child, grandchild or sibling	Six months to five years of imprisonment and a fine from 500,000 Kip to 2,000,000 Kip Three months to one year of imprisonment and a fine from 50,000 Kip to 300,000 Kip (for partners)[21]
Latvia	Legal
Lesotho	Legal
Liberia	Illegal	Lineal ancestors and descendants Full and half-siblings	Up to three years in prison
Liechtenstein	Illegal	Lineal ancestors and descendants Full siblings and half siblings	Up to 3 years in prison or fine
Lithuania	Legal
Luxembourg	Legal (1810–1941 and since 1944/45 (1942–1944/45 illegal pursuant to § 173 German penal code)
Macau	Legal
Madagascar	Legal
Malaysia	Illegal	Relatives prohibited by religious law	From six to 20 years in prison Flagellation
Malawi	Illegal	"Carnal knowledge of" (sexual intercourse with): grand-daughter, daughter, sister, mother or grandmother (if male) grandfather, father, brother, or son (if female from the age of 16).	Imprisonment for five years.[22]
Mali	Legal
Marshall Islands	Illegal	Marriage, cohabitation or sexual intercourse with another of such a close blood relationship or affinity that marriage between the two who so engage is prohibited by custom.	Classified as felony of the third degree, which is punishable by a fine of $5,000 or imprisonment for no more than thirty-five months.[23]
Mauritius	Illegal	Lineal ancestors and descendants Full and half-siblings	Imprisonment[24]
Mexico	Legal
Moldova	Illegal	Relatives in the direct line up to and including the third degree of kinship, as well as between relatives in the collateral line (brothers and sisters)	Imprisonment for up to 5 years Not subject to criminal liability if under 18 years of age and the age difference between them does not exceed 2 years[25]
Mongolia	Legal
Montenegro	Legal
Mozambique	Legal[26]
Myanmar	Illegal
Nauru	Illegal	Lineal ancestors and descendants Full and half-siblings	10 years imprisonment,[27]
Nepal	Illegal	Lineal ancestors and descendants Collateral relatives within (including) 7 degrees	Imprisonment for life for sexual intercourse between the natural mother and her natural son or between the natural father and his natural daughter Imprisonment for four to ten years and a fine of रु (rupees) 40,000–100,000 for sexual intercourse between: stepmother and stepson stepfather and stepdaughter full blood brother and sister father-in-law and daughter-in-law within the same branch grandfather and granddaughter or great-granddaughter within the same branch brother-in-law and sister-in-law within the same branch Imprisonment for three to six years and a fine of रु 30,000–60,000 for sexual intercourse between: grandmother and her grandson or great-grandson within the three generations of the same branch father's elder brother or uncle and niece within the same branch aunt (including the wife of own father's brother) within the same branch father-in-law and brother's daughter-in-law within the same branch uterine maternal uncle and niece or nephew and maternal aunt mother's sister and nephew or between mother-in-law (one's wife side) and son-in-law Imprisonment for one to three years and a fine of रु 10,000–30,000, having regard to, inter alia, the branch, relationship and generation, for sexual intercourse between persons in collateral relatives within (including) 7 degrees, except that referred to in clause (a), (b) or (c)[28]
Netherlands	Legal
New Zealand	Illegal	Lineal ancestors and descendants Full or half-siblings	Up to 10 years in prison
Nicaragua	Legal
Niger	Legal
Nigeria	Illegal	Lineal ancestors and descendants Full and half-siblings	Death
North Korea	Illegal	Lineal ancestors and descendants Collateral relatives within (including) 4 degrees	Death
North Macedonia	Illegal
Northern Cyprus	Illegal	Child, grandchild, sibling, adopted child or child of his/her sibling who is below the age of 18 Grandchildren, child, mother, father, grandfather, grandmother, aunt, uncle, maternal uncle or aunt who is more than 18 and aware of the familial relation between the two Sibling, step-sibling, adopted sibling who is also between 16 and 18[29]	Life imprisonment Up to six months imprisonment or a fine
Norway	Illegal	Lineal ancestors and descendants Siblings Stepfamily Adopted descendants	Up to six years in prison
Pakistan	Illegal	Lineal ancestors and descendants Full and half-siblings	Death
Palau	Illegal	Within the degrees of consanguinity or affinity within which marriage is prohibited by law or custom	Imprisonment for a period of not more than twenty-five years, or fined up to fifty thousand dollars ($50,000), or both[30]
Panama	Legal
Paraguay	Legal
Peru	Legal
Philippines	Legal[31]
Poland	Illegal	Lineal ancestors and descendants Adopted children and parents Full and half-siblings	From three months to five years in prison
Portugal	Legal
Qatar	Illegal	Lineal ancestors and descendants Full and half-siblings	Death
Republic of the Congo	Legal
Romania	Illegal	Parent, grandparent, child, grandchild Brother, sister, half-brother, half-sister Uncle or aunt (by blood) Nephew or niece First cousin Grandaunt (by blood), granduncle (by blood), grandniece, grandnephew	Between one and five years of imprisonment[32]
Russia	Legal
Samoa	Legal (if aged 21 or older) / Illegal (if under the age of 21)	parent and child, siblings, half-siblings, or grandparent and grandchild “child” includes an illegitimate child or an adopted child; and “grandchild” has a corresponding meaning	Imprisonment for a term not exceeding 14 years[33]
Saudi Arabia	Illegal	Lineal ancestors and descendants Full and half-siblings	Death
Saint Kitts and Nevis	Legal
Saint Lucia	Legal (for opposite-sex couples) / Illegal (for same-sex couples)		For same-sex couples: Ten years of imprisonment
Saint Vincent and the Grenadines	Legal (for opposite-sex couples) / Illegal (for same-sex couples)		For same-sex couples: Ten years of imprisonment
Senegal	Illegal	Lineal ancestors and descendants Full and half-siblings	Up to three years in prison
Serbia	Legal
Seychelles	Illegal	Grandfather, father, brother, half-brother, son or grandson grandmother, mother, sister, half-sister, daughter or grand-daughter	Imprisonment for 3 years[34]
Sierra Leone	Illegal	Brother, half-brother, nephew, father, son or grandfather Sister, half-sister, mother, grandmother, daughter or niece	Imprisonment for a term not less than five years and not exceeding fifteen years[35]
Singapore	Illegal	Lineal ancestors and descendants Full and half-siblings Uncle (by blood), aunt (by blood), nephew, niece	Up to ten years in prison
Slovenia	Legal
South Africa	Illegal	Ascendants and descendants in the direct line Collaterals, if either of them is related to their common ancestor in the first degree of descent	[36]
South Korea	Legal
Somalia	Illegal	Lineal ancestors and descendants Full and half-siblings	Death
South Sudan	Illegal	Lineal ancestors and descendants Half or full sibling, uncle (by blood), aunt (by blood), niece, nephew Same-sex relations are always prohibited	Up to seven years in prison Fine[37]
Spain	Legal
Sri Lanka	Illegal	Directly descend from the other, adoptive parent, adoptive grand parent, adopted child or adopted grand child Sister, either by the full or the half blood or by adoption, daughter of his brother or of his sister, by the full or the half blood or by adoption, a descendant from either of them, the daughter of his wife by another father, his son's or grandson's or father's or grandfather's widow Brother of the female either by the full or the half blood or by adoption, the son of her brother or sister by the full or the half blood or by adoption, a descendant from either of them, the son of her husband by another mother, her deceased daughter's or grand daughter's or mother's or grand mother's husband	Imprisonment for a term not less than seven years and not exceeding twenty years and with fine Imprisonment for a terms which may extend to two years (if attempted)[38]
Sweden	Illegal	Vaginal intercourse illegal for the ancestor, imprisonment up to 2 years[39] Vaginal intercourse illegal for full siblings, imprisonment up to 1 year[39]
Switzerland	legal (for same-sex couples) / Illegal (for opposite-sex couples)	Lineal ancestors and descendants Full siblings and half siblings	Up to three years in prison or fine
Sudan	Illegal	Lineal ancestors and descendants or their spouses Sister, brother or their children, aunt (by blood) or uncle (by blood) Same-sex relations are always prohibited	Death if relations are same-sex; Additional punishment of up to five years in prison otherwise[40]
Suriname	Legal
Syria	Illegal	Parents and offspring, brothers and sister, step-brother and step-sister, or those of the same category among in-laws	One to three years imprisonment If one of the offenders has legal or actual authority over the victim, the penalty shall not be less than two years, and the offender is denied the right of guardianship.[41]
Taiwan	Illegal	Lineal ancestors and descendants. Collateral relatives within (including) 3 degrees.[42]	Up to five years imprisonment, but prosecution cannot start without a complaint by the victim within six months of them being aware of the identity of the offender (Antragsdelikt).[42][43]
Tajikistan	Legal
Tanzania	Illegal	Granddaughter, daughter, sister or mother (male) Grandfather, father, brother or son (female) Same-sex relations are always prohibited	Up to five years in prison[44]
Thailand	Legal
Timor-Leste	Legal
Togo	Illegal	Lineal ancestors and descendants Full and half-siblings	Prison sentence
Trinidad and Tobago	Illegal	Parent, child, brother, sister, grandparent, grandchild, uncle (by blood), niece, aunt (by blood) or nephew	Imprisonment for life[45]
Tunisia	Illegal	The rape of a child that is carried out by: Brothers and sisters The son of any of his or her brothers or sisters Any of their descendants The husband's father or the wife's father or the mother's husband or the father's wife or the husband's family Persons who are spouses of a brother or sister	Twelve years imprisonment (six years for indecent assault, doubled if the perpetrator is a family member or relative of the victim)[46]
Turkey	Legal
Turkmenistan	Illegal	Lineal ancestors and descendants Full and half-siblings	Prison sentence
Uganda	Illegal	Lineal ancestors and descendants Full and half-siblings	Life imprisonment
Ukraine	Legal
United Arab Emirates	Illegal	Lineal ancestors and descendants Full and half-siblings	Death
United Kingdom	Illegal	Parent, grandparent, child, grandchild Brother, sister, half-brother, half-sister Uncle or aunt (by blood) Nephew or niece	Up to two years imprisonment for sex between adult relatives (penetration)[47] Up to 14 years imprisonment for sexual activity with a child family member[48]
United States	legal (only 2 states: Rhode Island and New Jersey) / Illegal (other 48 states)	Varies by states	Varies by states
Uruguay	/ Legal (unless it provokes public scandal)
Uzbekistan	Illegal	Lineal ancestors and descendants Full and half-siblings	Prison sentence
Vanuatu	Illegal	Starting from the age of 16 for both sexes, sexual intercourse between: parent and child (including an adopted child); brother and sister (including half blood); grandparent and grandchild.	Imprisonment for 10 years.[49]
Venezuela	/ Legal (unless it provokes public scandal)
Vietnam	Illegal	Lineal ancestors and descendants Sibling or half-sibling	From one to five years in prison[50]
Zambia	Illegal	Granddaughter, daughter, sister, mother (male) Grandfather, father, brother, son (female) Same-sex relations are always prohibited	Up to five years in prison[51]
Zimbabwe	Illegal	Lineal ancestors and descendants Collateral relatives within (including) 6 degrees	Up to five years in prison, or fine up to US$5000, or both

In Zimbabwe, most forms of incest are illegal and an offender is currently liable to a fine up to or exceeding level fourteen (about US$5000) or imprisonment for a period not exceeding five years or both.^[52] Incest is classified as "sexual intercourse within a prohibited degree of relationship".^[53] A prohibited degree of relationship would be that of a parent and their natural or adoptive child, a step-parent and their step-child, whether the step-child's parent and step-parent are married under the Marriage Act [Chapter 5:11] or the Customary Marriages Act [Chapter 5:07], or are parties to an unregistered customary law marriage, and whether or not the child was over the age of eighteen years at the time of the marriage; a brother and sister, whether of whole or half blood; or an uncle and his niece; or a grand-uncle and his grand-niece; or an aunt and her nephew; or a grand-aunt and her grand-nephew; or a grandparent and their grandchild and any person and their first or second cousin. In cases of first and second cousins an individual charged with such a crime can raise a defense that the cultural or religious customs or traditions of the community to which they belong does not prohibit marriage between first or second cousins; or in the case of a person who is a member of a community governed by customary law, that the cultural or religious customs or traditions of the particular community to which they belong does not prohibit marriage between first or second cousins.

Under Canadian federal law, incest is defined as having a sexual relationship with a sibling (including half-sibling), child/parent or grandchild/grandparent, requiring knowledge of the existence of the blood relationship. Everyone who commits incest is guilty of an indictable offence and is liable to imprisonment for a term of not more than 14 years and, if the other person is under the age of 16 years, to a minimum punishment of imprisonment for a term of five years.^[54]

Laws regarding incest in the United States vary widely among jurisdictions regarding both the definition of the offense and penalties for its commission. The laws regarding incest in the United States article summarizes these laws for individual U.S. states and the District of Columbia.

In the United States, the District of Columbia and every state and inhabited territory have some form of codified incest prohibition. In most states, sexual activity between a lineal ancestor and a lineal descendant (parent, grandparent with child or grandchild), siblings (brother-sister) and aunt-nephew, uncle-niece is penalized as incest. However, individual statutes vary widely. Rhode Island has repealed its criminal incest statute,^[55] and only criminalizes incestuous marriage.^[56][57] Ohio "targets only parental figures",^[55] and New Jersey penalize it either as aggravated sexual assault when both parties are under 16 years of age, as sexual assault over 16 years of age but under 18, or as "sexual conduct which would impair or debauch the morals of the child" in the case of a parent or another adult having legal care of a child under 18 years of age.^[58][59][55] The most severe penalties for incest are in Massachusetts, Virginia, Texas and Oregon, which punish incest with up to 20 years in prison, Georgia where a penalty for incest is up to 30 years in prison, Wisconsin where the penalty for incest is up to 40 years in prison, and in the states of Colorado, Nevada, Montana, Idaho and Michigan where a penalty of up to life imprisonment for incest may be given.

In some states, sex between first cousins is prohibited (see cousin marriage law in the United States by state for cousin sex, as well as cousin marriage, being outlawed in some states). Many states also apply incest laws to non-blood relations, including stepparents, stepsiblings, in-laws and people related through adoption.^[60]

In Hong Kong, a special administrative region of China, it is illegal to have sexual intercourse with certain close relatives, even if they are consenting adults. The prohibited relationships are grandfather-granddaughter, father-daughter, brother-sister and mother-son. Punishment is up to 20 years' imprisonment for male offenders and up to 14 years' imprisonment for female offenders.^[61] The law does not cover sexual intercourse with more distant relatives, such as an aunt, uncle, niece, nephew and cousin. It only addresses male-on-female and female-on-male sexual intercourse, and it appears that consensual same-sex incest is not illegal. The law makes an assumption that a female below the age of 16 has no ability to consent to sexual intercourse, therefore a female below 16 cannot commit incest.

On 5 December 2019, the Law Reform Commission of Hong Kong ("LRC") published a report on Review of Substantive Sexual Offences making final recommendations for the reform of substantive sexual offences in the Crimes Ordinance (Cap 200). It recommended that "the offence of incest should be reformed to become gender neutral; to cover all penile penetration of the mouth, vagina and anus and other forms of penetration; and be extended to cover uncles (aunts) and nieces (nephews) who are blood relatives as well as adoptive parents".^[62]

In Malaysia, it is illegal to have sexual intercourse with a person who under the law, religion, custom or usage that applies to the person he or she is not permitted to marry on account of their relationship.^[63]

In addition to whipping, persons convicted of incest face a minimum sentence of six years' imprisonment and a maximum sentence of 20 years' imprisonment. It is a defense against the charge if the person did not know the relationship was not permitted or if the sexual intercourse was done without his or her consent. Girls below the age of 16 and boys below the age of 13 are deemed to be incapable of giving consent. (The age of consent for sex in Malaysia is 16 for both sexes.^[64])

While it is unclear to which family members the incest law applies, a verdict from the High Court in Sabah and Sarawak in 2011 provided some indication about the sentencing guidelines. It described incest as a "heinous crime" but that the degree of kinship between the parties dictates the "level of repulsion" which the court translates into a sentence imposed. The verdict said the worst on such a scale is incest committed by a father to his biological daughter or a brother to his biological sister, and that such offenders should receive the harshest sentence. It said an uncle and his maternal niece committing incest is not on that same level and, if there was no violence involved, the length of the sentence should reflect it.^[65]

There are more severe sentences for those who commit incest through rape. The offence of incestuous rape is punishable with not less than eight years' imprisonment and not more than 30 years' imprisonment. In addition, those convicted receive not less than 10 strokes.^[66]

Malaysian law also considers sexual intercourse with the stepfamily to be incestuous.^[67]

The legal code of Pakistan defines incest as marriage (consortion) between a male and either his:

• Wife or former wife of father, grandfather and further ancestors
• Mother, grandmother and further ancestors
• Daughter, granddaughter and further descendants
• Full or half-sister
• Parents' sisters, grandparents' sisters and further ancestors' sisters
• Daughter, granddaughter and further descendant of full or half-sibling
• Suckling ancestor
• Suckling sister
• Mother, grandmother and further ancestors of wife or former wife
• Daughter, granddaughter of wife or former wife
• Wife or former wife of true son or grandson and further descendants
• Sororal polygyny
• Close relations or blood relations

Countries that prohibit incest include: (all articles refer to the Penal Codes) Albania Article 106,^[68] Slovenia Article 195,^[69] Slovakia Section 203,^[70] Serbia Article 197,^[71] Poland Article 201,^[72] Norway Article 197 and 198,^[73] Hungary Article 199,^[74] Bulgaria Article 154,^[75] and Cyprus Article 147.^[76]

Countries that allow consensual incest if both are over 18 include Belarus, Belgium, Estonia, Latvia, Lithuania, France, Russia, Spain, Ukraine, and Portugal.^[77] Russia and Belarus also allow incest between teenagers (under 18).^[78] Estonia, Latvia, and Ukraine prohibit incest if one has custody over the other.^[79]

In Austria, incest between lineal ancestors and descendants and between full siblings is prohibited. It is punishable by up to three years in prison.^[80]

There is no law specifically criminalising incest in Belarus. Section 168^[81] of the criminal code prohibits sex (including incest sex) with anyone under 16 (the age of consent) if the older person is an adult over 18.

Section 188 of the Czech Criminal code^[82] prohibits incest between lineal ancestors and descendants and siblings. The maximum penalty is three years of imprisonment.^{[citation needed]}

In Denmark, incest is sex between lineal ancestors and descendants and between full siblings. Sex with a descendant is punishable by up to six years imprisonment. Sex between siblings is punishable by up to two years imprisonment.^[83][84]

In Estonia, sexual intercourse or commission of another act of sexual nature by a parent, person holding parental rights or grandparent with a child or grandchild is punishable by two to eight years imprisonment.^[11]

In Finland, sexual acts between one's full sibling (but not half-sibling), ancestor or descendant are punishable by a fine or up to two years in prison for "sexual act between close relatives". However, no punishment is given to a person who was under 18 years old when performing a sexual act with a parent or grandparent or if the person was forced or illegally persuaded to perform the sexual act.^[85] The marriage law defines, that marriage between one's sibling, half-sibling, ancestor or descendant is forbidden.^[86]

The French Penal Code of 1810, which was promulgated by Napoleon I, and became the criminal law in many of the territories occupied at the time by the First French Empire, abolished incest laws in France,^[87] Belgium, and Luxembourg.

In 2010, France reinstated laws against incest by introducing article 222-31-1 of the penal code. From February 10, 2010, to September 17, 2011, rape and sexual assault were classified as incest when they are committed "within the family on a minor by an ascendant, a brother, a sister or any other person, including a cohabitant of a family member, who has de jure or de facto authority over the victim."^[88]

There were subsequently multiple changes to the definition of incest.

On 16 September 2011, the Constitutional Council repealed article 222-31-1 of the penal code, saying that if it was possible for the legislator to institute a particular penal qualification to designate incestuous sexual acts, they could not, without disregarding the principle of legality of offences and penalties, refrain from precisely designating the persons who must be considered, within the meaning of this qualification, as members of the family.^[89]

Incest was once again reinstated in 2016. From March 16, 2016, to August 6, 2018, rape and sexual assault are considered incestuous when they are committed on a minor by:

1. An ancestor;
2. A brother, sister, uncle, aunt, nephew or niece;
3. The spouse or partner of one of the persons mentioned in (1) and (2) or the partner bound by a civil solidarity pact with one of the persons mentioned in 1 and 2, if he or she has de jure or de facto authority over the minor.^[90]

On 6 August 2018, "if he or she has de jure or de facto authority over the minor" in (3) was changed to "if he or she has de jure or de facto authority over the victim."^[91]

In Germany, illegal incest is defined as vaginal intercourse between lineal ancestors and descendants (parents, grandparents, great-grandparents and their children, grandchildren, great-grandchildren) and between full and half-siblings (due to this definition other sexual practices, including homosexual intercourse, are not punishable).^[92] The penalty is a fine or up to three years of prison. Incest between relatives who are minors (below 18 years old) at the time of offence is not punishable but remains a crime, therefore aiding and abetting of incest between related minors is punishable.

Regarding marriage, the same rules apply and prohibit marriage between aforementioned relatives, but also includes marriages between siblings by adoption.^[93]

The criminal liability of incest among consenting adults is disputed among German citizens and politicians. In the case of Patrick Stübing, the Federal Constitutional Court ruled in 2008 that the criminalization of incest is constitutional in a 7:1 vote with one judge dissenting.^[94]

In September 2014 the majority of the German Ethics Council recommended that the government abolish laws criminalizing consensual incest between adult siblings, while not broaching the question of to what extent criminal liability for incest between parents and children of legal age might be abrogated. A minority of nine members of the Council dissented, opposing a repeal of Section 173 of the Criminal Code^[95][96]

Article 345^[97] of the Greek Penal Code as modified by Article 2, Paragraph 8 of Law 3625/2007^[98] and Article 3 Paragraph 10 of Law 3727/2008^[99] prohibits incestuous relations between relatives of both ascending and descending line, and between half or full siblings, and imposes (1) for the ascending relative (for example father, uncle, grandfather etc.): at least 10 years' imprisonment if the descending relative is under 15 years old, imprisonment if 15 but not 18 years old, and maximum two years' imprisonment if 18 years and older; (2) for the descending relative (for example child, nephew etc.) maximum two years' imprisonment; (3) for half- or full siblings maximum two years' imprisonment. Paragraph 2 of Article 345 Penal Code also states that if the descending relative and the half or full siblings were under 18 years old, they might be cleared of any charge.

Also, Article 1357^[100] of the Greek Civil Code prohibits the marriage of relatives of direct blood line in totality, and up the four degrees of consanguinity of the secondary blood line (for example you can marry the first cousin of your mother / father, but not your first cousin), also the marriage of relatives five or six degrees of consanguinity is under permission only.^[101] Article 1358 of the Greek Civil Code also prohibits the marriage of relatives in law totally in direct blood line, and up the third degree of the secondary blood line.

Article 200^[102] of the Icelandic Penal Code prohibits incestuous relations between relatives of both ascending and descending line, and between half or full siblings, and (1) imposes for the ascending relative (for example father, uncle, grandfather etc.): imprisonment up to a maximum of 12 years if the descending relative is between 15 and 17 years old, imprisonment up to a maximum of eight years if 18 years and older; (2) for siblings a maximum four years' imprisonment—if the half or full siblings were under 18 years old, they might be cleared of any charge.

Incest is illegal in the Republic of Ireland under the Punishment of Incest Act 1908,^[103] which pre-dates the foundation of the state.

It is illegal for a male to have sexual intercourse with his granddaughter, mother, daughter, sister, or half-sister; and for a female (over 16 years of age) with her grandfather, father, son, brother, or half-brother. The act does not refer to other familial relationships (such as grandson-grandmother), or same-sex relations.^[103]

Prior to the amendment of the 1908 Act in 2019, incest was punishable by up to seven years' imprisonment for a female and up to life imprisonment for a male. The Criminal Law (Sexual Offences) (Amendment) Act 2019 amended the Act of 1908 to provide for a maximum term of 10 years' imprisonment for both males and females.^[104][105]

Occasionally, offenders convicted of incest will be admitted to a psychiatric hospital for psychiatric treatment.^{[citation needed]}

Incest is illegal in Italy only if it provokes public scandal, according to Article 564 of the Penal Code and punishable from two to eight years' imprisonment, open to more years for the older person if the other was under aged.^[106] For incest to be a “public scandal” the incest must be done in a blatant manner. The fact that someone reports incest to the authorities does not by itself make it a public scandal.^[107]

Incest is not criminally prohibited in Latvia except as part of the general protection of adolescents from sexual abuse.^[108]

Criminal Code of Lithuania does not explicitly foresee a criminal punishment for incest between adults. However, it does state that "A father, mother, guardian, custodian or another lawful representative of a child or a person holding statutory powers in respect of a minor who has sexual intercourse or otherwise satisfied his sexual desires with that minor, in the absence of characteristics of a rape, sexual assault or sexual abuse, shall be punished by a fine or by restriction of liberty or by arrest or by a custodial sentence for a term of up to six years." Thereby, the law explicitly foresees a criminal punishment for incest between a parent and a child or for persons of similar standing.^[109]

Consensual incest between adults is legal in the Netherlands.^[110] Marriage is forbidden between ancestors and descendants or between siblings, although the Minister of Justice may grant dispensation in the case of siblings by adoption. Marriage between blood relations of the third and fourth degree are possible, but require both partners to sign a declaration of consent (Dutch civil law book 1, articles 41 and 41a^[111]).

Incest is illegal in Norway and is defined as intercourse between ancestors and descendants (including adopted descendants), siblings, and even stepfamily. It is punishable by up to six years in prison.^[112]

In Poland, incest is defined in Article 201 of the Penal Code^[113] as sexual intercourse with an ancestor, descendant, guardian, ward, brother, or sister, and is punishable by imprisonment for no less than three months and no more than five years.

Incest is not specifically prohibited under Portuguese law.^[114]

Incest is defined in the Penal Code as "consensual sexual relations between lineal relatives or between siblings" and is punished by a year to five years in prison.^[115]

In Russia, sexual activity (including incest) between persons who are over the age of consent (16 in Russia) is not a criminal offence.^{[116][110][user-generated source?][117]}

However, under the Family Code of Russia, persons who are related lineally, siblings, half-siblings, and a stepparent and a stepchild may not marry.^[118]

Incest between consenting adults has been decriminalized in Serbia since the adoption of the 2005 Penal Code. Article 197 of the Penal Code prohibits only incest between an adult and a minor relative and between an adult and a minor sibling. Amendments in 2009 increased the penalty from the previous three year prison sentence to a term between 6 months minimum and a 5 year maximum prison sentence.^[119]

Incest in Slovenia is not criminally prohibited unless one person is a minor. A person who has sexual relations with a blood relation minor is punished to two years in prison.^[120]

Consensual incest is legal in Spain since there is no law against it. However, both parties must be over the age of consent in Spain (16) to have sex.^[110][121]

Vaginal intercourse with a descendant or a full sibling is prohibited by law in Sweden.^[39][122] Other kinds of sexual activity, including same-sex activity, are not directly penalized. Half-siblings can engage in sexual intercourse and even marry, but require special approval by the government.

Article 213 of the Swiss Criminal Code prohibits incest. Intercourse among siblings or other persons related by blood in direct line is punishable by up to three years' imprisonment.^[123] The federal government proposed to abolish this prohibition in 2010, arguing that in the few cases where persons were convicted of incest (three since 1984), other sexual crimes such as child sexual abuse were also committed.^[124]

There appears to be no law prohibiting incest^[125] but there is a law restricting it. Article 155 of the criminal code prohibits penetrative sex with anyone under 16. The same article also prohibits incest with a person under 16 with whom one has custodial authority (such as father-minor-daughter).

Legislation regarding sexual offences in the United Kingdom is devolved. Sex with an adult who is related as parent, adoptive parent, grandparent, child, adopted child, grandchild, brother, sister, half-brother, half-sister, uncle, aunt, nephew or niece, is illegal. In England and Wales the offence is against the Sexual Offences Act 2003^[126] which effectively replaced the offence of incest with two new wider groups of offences: familial child sex offences (sections 25–29) and sex with an adult relative (sections 64–65). The punishment for sex between adults knowingly related in the aforementioned ways via penetration is liable to a maximum imprisonment for a term not exceeding two years.^[47] While sexual activity with a child family member can incur imprisonment for a term not exceeding 14 years.^[48] These laws are intended to protect the rights of people, so as to avoid potential violation. However, these laws still outlaw consensual sexual relationships between family members, even if they are fully willing and knowledgeable of the potential consequences.^[127] There has been some debate surrounding the rhetoric used by the Sexual Offences Review Team. Roffee discusses how the language used manipulates the reader to deem consensual familial sexual acts as not only illegal, but also immoral.^[128] In Northern Ireland similar offences are against the Sexual Offences (Northern Ireland) Order 2008.^[129]

In Scotland the offence is against the Criminal Law (Consolidation) (Scotland) Act 1995,^[130] the provisions of which effectively replaced the Incest and Related Offences (Scotland) Act 1986^[131] (although the 1986 Act was not actually repealed until 2010).^[132] Prior to the 1986 Act the law was based on the Incest Act 1567 which incorporated into Scots criminal law Chapter 18 of the Book of Leviticus, using the version of the text of the Geneva Bible of 1562.^[133] In January 2016 a petition calling for "Adult Consensual Incest" to be decriminalised was submitted to the Scottish Parliament's Public Petitions Committee, but the petition was not debated and no change was made to the law.^[134] In August 2016 and December 2017, further petitions were submitted to the Scottish Parliament's Public Petitions Committee.^[135][136]

In Australia, federal marriage law prohibits marriage between an ancestor and descendant or siblings (including a sibling of half-blood), including those traced through adoption.^[137] However, under federal law, sexual conduct between consenting adults (18 years of age or older) is legal,^[138][139] which also applies to close family members.^[140] but what constitutes incest and penalties vary.

In all Australian states and territories except New South Wales, sexual intercourse between a lineal ancestor and a lineal descendant is incest. In New South Wales, incest involves "close family members", which are "parent, son, daughter, sibling (including a half-brother or half-sister), grandparent or grandchild, being such a family member from birth".^[141] In Queensland, unlawful incest also includes sexual intercourse between an uncle or aunt with their niece or nephew, although here its application is curtailed by the effect of the federal Marriage Act 1961, as the Queensland Criminal Code states that the crime of incest does not apply to "persons who are lawfully married or entitled to be lawfully married". Thus, it is not incest for a niece aged 16 or over to engage in sexual intercourse with her uncle or aunt, or a nephew aged 16 or over to engage in sexual intercourse with his aunt or uncle (the Marriage Act allows same-sex marriage).

In New South Wales, incest is generally only applied in cases where both participants are aged 16 or over (the age of consent in the state). Where a participant is aged between 10 and 16 years of age, the older participant would generally be charged with sexual intercourse with a child under the age of 16, while in cases when a participant is under 10, the older participant would generally be charged with sexual intercourse with a child under the age of 10. In the other states and territories, incest can also arise where one of the parties is below the age of consent, but this does not exclude the possibility of bringing the more general charge of sexual intercourse with a child under the age of 10 (New South Wales and Northern Territory), 12, 13 (Western Australia), 14 (South Australia), 16 or 17 (South Australia and Tasmania) as the case may be. This is particularly relevant where a certain form of sexual conduct between related persons falls outside of the legal definition of incest in a particular jurisdiction.

In no state or territory is consent a defense to incest. The maximum penalty for incest varies: eight years' imprisonment in New South Wales;^[141] 10 years' imprisonment in South Australia; 20 years' imprisonment in Western Australia and the Australian Capital Territory; 25 years' imprisonment in the Northern Territory, Victoria, and Tasmania; and life imprisonment in Queensland.

In regards to sex offender registration, any person convicted of incest is required to register as a sex offender seven days after their release from custody: one conviction for incest means an offender is required to comply with reporting obligations for 15 years, while one conviction for incest with a class 2 offence or two or more convictions for incest means an offender is required to comply with reporting obligations for the remainder of their life.

Incest is illegal in Papua New Guinea.^[142]

In New Zealand, incest is sexual connection between a parent and child (both biological and adopted), grandparent and grandchild (both biological and adopted), and full and half-siblings.

It is a defence if the person was unaware of the relationship at the time of the act (i.e. accidental incest). A conviction for incest attracts a maximum penalty of 10 years' imprisonment.^[143] Incest was the only sexual crime punishable by seven years or more imprisonment that was not subject to the country's "three-strikes" law before they were repealed in 2022.^[144]

Although the general age of consent for sexual activity is 16 in New Zealand, separate provisions under the law prohibit sexual contact with step-children, foster children and wards, even if they are aged 16 or 17. A conviction for having a sexual connection, or attempting to have a sexual connection, with a dependent child attracts a maximum penalty of seven years' imprisonment.^[145]

• Jewish views on incest
• Mahram

• Hughes, Graham. "The Crime of Incest." Journal of Criminal Law and Criminology, Fall 1964. Volume 55, Issue 3 (September), Article 2, p. 322-331.

• World Population Review:Where incest is legal Countries Where Incest Is Legal 2023

• Incest laws and map for Europe Legality of Incest Throughout Europe

• Lifting the veil on incest The historical development of the offense