
Adultery laws, which have existed in some form for centuries, remain a crime in several parts of the world, including 16 U.S. states and Puerto Rico. While prosecutions are rare, these laws can have legal consequences, particularly in divorce proceedings. The constitutionality of adultery laws is uncertain, and they are rarely enforced. Opponents argue that they are archaic and violate privacy rights, while proponents point to their historical presence. As societal attitudes and legal interpretations evolve, the future of these laws remains unclear, with some states recently repealing them.
| Characteristics | Values |
|---|---|
| Adultery laws in the US | Adultery is a crime in multiple states and Puerto Rico, but prosecutions are rare. |
| Adultery laws in other countries | Adultery is not a crime in the People's Republic of China, but it is grounds for divorce. Adultery was decriminalized in South Korea in 2015. |
| Constitutionality | The US Supreme Court has never directly ruled on the constitutionality of adultery laws, but has established a right to privacy in criminal law. |
| Arguments for adultery laws | Adultery laws have a long history and predate the founding of the US. |
| Arguments against adultery laws | Adultery laws are rarely enforced and may be seen as inconsistent with modern sexual attitudes. They may also be used to target LGBTQ+ individuals and those in non-monogamous relationships. |
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What You'll Learn

Adultery laws and the right to privacy
Adultery laws have existed in some form for centuries, with harsh punishments for those found guilty. In modern times, adultery remains a crime in several countries and states, although prosecutions are rare. The constitutionality of these laws has been questioned, particularly regarding the right to privacy.
In the United States, adultery is a crime in several states, including Michigan, Oklahoma, and Wisconsin, where it is considered a felony. However, the Supreme Court has never directly ruled on the constitutionality of adultery laws. The right to privacy has been recognised in cases such as Griswold v. Connecticut, where the Supreme Court held that a Connecticut law restricting access to contraceptives was unconstitutional. Similarly, in Lawrence v. Texas, the Supreme Court struck down a law criminalising sodomy based on the constitutional right to privacy.
The constitutionality of adultery laws is further complicated by the fact that they are rarely enforced. Opponents of these laws argue that they are outdated and inconsistent with modern sexual attitudes. Additionally, adultery laws have been criticised for discriminating against women, as they are often enforced disproportionately against women and treat them as the property of their husbands. The United Nations Working Group on discrimination against women has stated that "adultery as a criminal offence violates women’s human rights".
In recent years, several states in the US have successfully repealed their adultery laws, including West Virginia, Colorado, and New York. These repeals demonstrate a broader political consensus that adultery laws are archaic and inconsistent with modern values. However, there are still concerns that the repeal of adultery laws could be used as a way to target the LGBTQ+ community or individuals in non-monogamous relationships.
While the constitutionality of adultery laws remains uncertain, the right to privacy has been increasingly recognised as a fundamental right. The impact of adultery laws on privacy, particularly in the context of consensual sexual relationships between adults, is a significant factor in the ongoing debate surrounding the legality of these laws.
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Adultery as grounds for divorce
Adultery laws vary across the world and are subject to different interpretations. In some regions, adultery is a criminal offence that can result in punishment, while in other places, it is not illegal but may have consequences under civil law, particularly in divorce proceedings.
In the United States, adultery laws differ from state to state. As of November 2024, adultery remains a crime in 16 states and Puerto Rico, but prosecutions are rare. Oklahoma, Michigan and Wisconsin are among the states with the strictest adultery laws, classifying it as a felony. On the other hand, several states, including West Virginia, Colorado, New Hampshire, Massachusetts, Utah and Idaho, have successfully repealed their adultery laws in recent years, reflecting a consensus that these laws are outdated and incompatible with modern values.
The constitutionality of adultery laws in the US is uncertain. The Supreme Court has not directly ruled on this issue, but its decision in Lawrence v. Texas in 2003, which struck down a law criminalising sodomy based on the right to privacy, could suggest that adultery laws may also be deemed unconstitutional. The legal landscape following Dobbs v. Jackson Women's Health Organization further increases the possibility that adultery laws could be upheld as constitutional.
Adultery is a common ground for divorce. In most states, adultery is a valid reason for divorce, allowing the spouse who was cheated on to file for divorce based on fault. Adultery can also impact other aspects of the divorce process, such as property division, alimony, and child custody. If the cheating spouse spent marital assets on the affair or engaged in financial infidelity, the other spouse may be entitled to a larger share of the marital property. Adultery may also result in higher alimony payments, especially if the cheating spouse was the primary breadwinner. Regarding child custody, if the cheating spouse's behaviour harmed the children or neglected their parenting responsibilities, the other spouse may be favoured in custody decisions.
In conclusion, while adultery laws vary across the US and their constitutionality is unclear, adultery remains a significant factor in divorce proceedings, influencing not only the grounds for divorce but also the financial and custodial outcomes for the spouses involved.
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Adultery and gender discrimination
Adultery laws are still on the books in many countries and states, and in some places, they are rarely enforced. However, in jurisdictions where adultery is illegal, punishments range from fines to caning and even capital punishment. Adultery laws have been criticised for being discriminatory, particularly towards women, and in some jurisdictions, they have been struck down by courts on the basis of gender discrimination.
Historically, adultery was often punished harshly, with penalties including capital punishment, mutilation, or torture. Since the 19th century, such punishments have gradually fallen out of favour, especially in Western countries. In the 17th century, adultery and bigamy were punishable by death in Scandinavia, although few people were actually executed. The last execution for adultery in England is believed to have taken place in 1654 when a woman named Susan Bounty was hanged. In China, punishments for adultery were differentiated based on gender until 1935.
In some countries, adultery laws have been repealed or struck down by courts specifically because they discriminated against women. For example, in Turkey, adultery laws were held to be invalid in the 1990s because they treated men and women differently. In Guatemala (1996) and Venezuela (2016), adultery laws were overturned based on the respective constitutions' gender equality clauses and human rights treaties, including CEDAW. The Federal Criminal Code of Mexico repealed its adultery law in 2011.
Adultery laws have been criticised by international organisations, including the United Nations, for violating women's human rights and privacy. The criminalisation of adultery has been linked to impunity for violence against women. In Muslim countries that follow Sharia law, the punishment for adultery may be stoning, which has been legally carried out in Iran and Somalia.
In the United States, adultery remains a crime in several states, and while prosecutions are rare, it can be punishable by up to five years in prison and/or a fine. Notable exceptions include the District of Columbia, which repealed its adultery law in 2003, and Pennsylvania, which abolished its adultery laws in 1973. In recent years, several other states have successfully decriminalised adultery, including West Virginia, Colorado, New Hampshire, Massachusetts, Utah, and Idaho.
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Adultery laws in conservative states
Adultery laws have a long history and have existed in some form for a long time. In the US, adultery laws were commonplace in existing state laws, and new states and territories often modelled their legislation on these. The Enlightenment attitudes of the Revolutionary Era gave way to the rising moralist sentiments of the Second Great Awakening, which saw more restrictive attitudes toward sex.
Adultery laws are still on the books in many states, and as of 22 November 2024, it remains a crime in 16 states and Puerto Rico, although prosecutions are rare. The laws are strictest in Michigan, Oklahoma, and Wisconsin, where adultery is considered a felony. Oklahoma's adultery law, for example, carries a sentence of up to five years in prison. In New York, adultery is classified as a Class B misdemeanour, punishable by up to 90 days in jail and a $500 fine, although legislators are considering repealing this law.
The constitutionality of adultery laws is uncertain. The US Supreme Court has never directly ruled on the issue, so any legal analysis must rely on other cases involving sex and privacy. The Supreme Court's decision in Lawrence v. Texas in 2003, which struck down a law criminalizing sodomy based on a constitutional right to privacy, may be relevant.
In recent years, several states have successfully repealed their adultery laws, including conservative states such as West Virginia, Utah, and Idaho. This suggests a broader political consensus that these laws are archaic and no longer fit for purpose in modern America. However, pushing for repeal always risks politicians being accused of immorality.
Adultery laws could potentially be used to selectively prosecute political opponents or groups that do not conform to traditional sexual values, such as the LGBTQ+ community. The laws could also affect those in non-monogamous relationships, a fairly large group, as a 2023 poll found that 34% of Americans described their ideal relationship status as something other than complete monogamy.
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Adultery laws in liberal states
Adultery laws have been a topic of debate in the United States, with some states moving to repeal them while others continue to enforce them. As of November 2024, adultery remains a crime in 16 states and Puerto Rico, with varying penalties and enforcement records. However, even in states that have decriminalized adultery, it may still carry legal consequences in divorce proceedings and child custody disputes.
In recent years, several liberal-leaning states have successfully repealed their adultery laws, reflecting a broader consensus that these laws are outdated and incompatible with modern values. These include Massachusetts, which decriminalized adultery in 2018, and Minnesota, which followed suit in 2023. New York is also considering repealing its adultery law, which classifies the act as a Class B misdemeanor punishable by up to 90 days in jail and a $500 fine. The push to repeal adultery laws in these states has been driven by arguments for reproductive rights and the belief that criminalizing intimate behaviour between consenting adults is an invasion of privacy.
The constitutionality of adultery laws remains uncertain, as the Supreme Court has never directly ruled on the matter. The Court's decision in Dobbs v. Jackson Women's Health Organization, however, has introduced new factors to consider, including its reliance on historical tradition and its willingness to overturn precedent. While some argue that adultery laws are rooted in religious doctrines and are painfully archaic, others defend their preservation for religious or moral reasons.
Adultery laws have been criticized as invasive and incompatible with the principles of limited government, particularly from a libertarian perspective. Opponents argue that the government should not intrude into personal lives and that disputes of this nature should be settled privately rather than through public prosecution and penalties. Additionally, adultery laws have been criticized for their discriminatory impact on women, with women's rights advocates calling for their repeal.
The enforcement of adultery laws varies, and prosecutions are generally rare. However, in states like Michigan, Oklahoma, and Wisconsin, adultery is considered a felony, carrying stricter penalties. The success of repeal efforts in both liberal and conservative states suggests a growing consensus that these laws are no longer aligned with societal norms and values.
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Frequently asked questions
The constitutionality of adultery laws in the US is uncertain. The Supreme Court has never directly ruled on the issue, but some argue that the right to privacy recognised in Griswold v. Connecticut could be interpreted to mean that adultery laws are unconstitutional.
Adultery remains a crime in 16 states and Puerto Rico, although prosecutions are rare. These states include Michigan, Oklahoma, Wisconsin, Virginia, Colorado, the District of Columbia, Idaho, Massachusetts, New Hampshire, Utah, and West Virginia.
Adultery is very rarely prosecuted in the US, but penalties can vary depending on the state. In Michigan, adultery is punishable by up to five years of imprisonment and/or a fine of up to $5,000. In Oklahoma, adultery can result in up to five years of imprisonment. In Virginia, adultery is a misdemeanour, but cheating spouses are not sent to jail. Instead, a spouse guilty of adultery may be denied spousal support.
Several states have recently repealed their adultery laws, including New York, Minnesota, and Idaho. There is a broader political consensus that these laws are archaic and should be removed from the books. However, some states like Maryland have criminalised adultery in recent years.











































