A History of Fornication Laws in the United States

Where did American fornication laws come from?

American fornication laws came from the colonial era, when legislatures in New England and elsewhere treated sex outside marriage as a public offense to be judged in court. In the legal sense, fornication is sexual intercourse between two people who are not married to each other; Cornell's Legal Information Institute notes that the same conduct is now usually called premarital sex ^[11]. Colonial codes made it a crime long before the United States existed.

Plymouth Colony is a well-documented example. Its first code of laws, adopted in 1636, listed fornication among punishable offenses, and its courts handled such cases constantly: in one sample of 191 convictions from 1633 to 1643, 35 concerned fornication or lewd behavior ^[1]. In the 1660s, another sample counts 35 fornication convictions out of 310, as many as for drunkenness ^[1]. The colony's penalties were whipping, the stocks, fines and bonds for good behavior ^[1].

Massachusetts Bay took a harsher line on adultery than on fornication. Its Body of Liberties, adopted in December 1641, listed adultery with a married woman among the capital crimes, with biblical references, but said nothing of fornication ^[2]; that offense was handled by other statutes and by the county courts. The daily workings of these courts are described in fornication in Puritan New England.

The justifications proved durable. When New Jersey defended its fornication statute in the 1970s, it still invoked the protection of marriage and public morals, alongside the prevention of venereal disease and of births outside marriage ^[9]. After independence, several states carried their morals offenses into new statute books, where some would remain for more than two centuries.

Timeline

1. 1636Plymouth Colony's first code of laws lists fornication among punishable offenses.
2. 1805North Carolina enacts the cohabitation statute that survives as G.S. 14-184.
3. 1833Georgia laws of 1833 are the earliest source cited for today's O.C.G.A. § 16-6-18.
4. 1880South Carolina enacts its adultery and fornication statute, still §§ 16-15-60 to 16-15-80.
5. 1887A federal anti-polygamy act punishes fornication with up to six months or a $100 fine.
6. 1977December 13: in State v. Saunders, New Jersey's Supreme Court strikes down the state fornication law.
7. 2003June 26: Lawrence v. Texas protects private consensual conduct between adults.
8. 2018-2023Massachusetts, Utah, Virginia, Idaho and Minnesota repeal their fornication laws.

How did 19th-century states write these laws?

Nineteenth-century states wrote fornication laws in three main forms: a ban on any intercourse between unmarried people, a ban on unmarried cohabitation, and a ban on habitual relations. North Carolina chose the cohabitation model early. Its statute, whose official history begins with an act of 1805 (cited as chapter 684), punishes a man and woman not married to each other who "lewdly and lasciviously associate, bed and cohabit together," and it adds that one partner's confession cannot be used against the other ^[3].

Georgia adopted the broadest version. Its current section 16-6-18 makes an unmarried person guilty of fornication for voluntary intercourse with another person, and its official history begins with the laws of 1833, carried through the codes of 1863, 1895, 1910 and 1933 and re-enacted in the 1968 criminal code ^[4]. Mississippi's unlawful cohabitation offense goes back to Hutchinson's code of 1848 ^[12].

South Carolina's 1880 act defined the offenses with unusual precision. Fornication, under its section 16-15-80, means two unmarried people living together and having intercourse, or having habitual intercourse without living together; adultery covers the same conduct when either partner is married to someone else ^[5]. A single act did not fall within these definitions: the statute aimed at ongoing relationships rather than isolated encounters.

Some states graded penalties by repetition or by race. Alabama's code, as quoted by the Supreme Court in 1883, punished a first conviction for adultery or fornication with a fine of at least $100 and up to six months in jail, rising to two years for a third offense with the same person, while a separate section punished interracial couples with two to seven years in the penitentiary ^[7]. That racial provision, and its long legal afterlife, is the subject of a separate article on Pace v. Alabama.

Did the federal government ever punish fornication?

Yes, at least once, through an 1887 act of Congress aimed at polygamy in Utah Territory. The act, printed at 24 Statutes at Large 635 and commonly known as the Edmunds-Tucker Act, amended the anti-bigamy law of March 22, 1882 ^[6]. Its section 5 provided that an unmarried man or woman who committed fornication could be imprisoned for up to six months or fined up to $100 ^[6].

The same act punished adultery far more severely, with up to three years in the penitentiary ^[6]. It also applied the old double standard: when a married man had relations with an unmarried woman, only the man was deemed guilty of adultery ^[6]. The bill became law without the president's signature after he failed to return it to Congress within the constitutional deadline ^[6].

Section 5 itself names no territory, but the act amended the 1882 anti-bigamy law and its sections 6 to 27 concern Utah ^[6]. It was not a nationwide ban on sex outside marriage, which remained a matter for the states. The federal government's other major intervention, the Mann Act of 1910, did not punish fornication as such but made it a crime to transport a woman across state lines for an "immoral purpose," a phrase the Supreme Court read broadly in 1917.

How were the laws enforced in practice?

In practice, fornication laws were enforced heavily in the colonial era and only sporadically afterward, often in cases where another concern, such as welfare costs or a failed rape prosecution, was really at stake. In the twentieth century, reported prosecutions were few, and each one drew attention. Cornell's Legal Information Institute observes that a statute nobody enforces is hard to challenge in court, which helps explain why such laws lingered ^[11].

New Jersey offers a revealing case. In State v. Saunders, two men charged with rape after a July 1973 incident in Newark were acquitted of that charge but convicted of fornication, a lesser offense the trial judge put to the jury on his own initiative; one was fined $50 under a statute allowing up to six months in jail ^[9]. On December 13, 1977, the New Jersey Supreme Court reversed by five votes to two, holding that the fornication statute violated the right of privacy and that the decision to engage in such conduct was "a fundamental personal choice" ^[9].

Idaho shows the welfare motive. In 1996, the prosecutor and sheriff of Gem County revived the state's fornication law, a misdemeanor carrying up to six months in jail and a $300 fine, to discourage teenage sex amid a rise in young unwed mothers receiving public aid ^[8]. The Seattle Times reported that about six people had been charged, including a 17-year-old high-school student identified after she applied for pregnancy-related medical assistance, who received a suspended sentence ^[8].

Other modern uses came through side doors. In Georgia, a 2003 juvenile case against a 16-year-old led the state Supreme Court to bar the fornication statute's use against private, unforced, non-commercial conduct; in Virginia, a 2005 civil suit over the transmission of a disease led the state Supreme Court to strike down the law. Each episode exposed how old statutes could resurface long after they had fallen out of routine use.

How did privacy rulings weaken them?

Privacy rulings weakened fornication laws by establishing, step by step, that the state cannot police consensual sexual conduct between adults in private. The first signal came from legal reformers rather than judges: the American Law Institute's Model Penal Code of 1955 did not recommend criminal penalties for consensual sexual relations conducted in private, and Illinois aligned its criminal law with the code in 1961, with other states soon following ^[10]. Illinois nonetheless kept a narrow offense of fornication, limited to conduct that is open and notorious.

The Supreme Court then built a right of privacy in a series of contraception cases. Griswold v. Connecticut (1965) protected married couples' use of contraceptives, and Eisenstadt v. Baird (March 22, 1972) struck down a law that barred distributing contraceptives to unmarried people ^[10]. In Eisenstadt the Court also refused to believe that the Massachusetts law truly aimed to deter fornication, then a misdemeanor in that state. State courts, as in New Jersey in 1977, applied the same reasoning directly to fornication statutes ^[9].

The decisive federal ruling came on June 26, 2003. In Lawrence v. Texas, the Court held, in an opinion joined by five justices (six voted for the judgment), that the Due Process Clause protects private, consensual intimate conduct between adults, and it overruled Bowers v. Hardwick (1986) ^[10]. The majority set clear limits, saying the case did not involve minors, public conduct or prostitution, while Justice Antonin Scalia's dissent listed fornication among the state laws whose basis the decision called into question ^[10]. Cornell's Legal Information Institute concludes that fornication laws cannot be enforced as a result ^[11]. The full reasoning is examined in how Lawrence v. Texas undermined fornication laws.

Which states repealed them, and which still have them?

Legislatures removed fornication laws one state at a time, and a handful of statutes remain in state codes as of October 2026. The most recent wave of repeals came between 2018 and 2023. Massachusetts acted through chapter 155 of the Acts of 2018, approved on July 25, 2018 ^[15]; Utah's section was repealed on May 14, 2019 ^[16]; Virginia removed its law through Acts 2020, chapter 122; Idaho's S.B. 1325, signed on March 22, 2022, took effect on July 1, 2022 ^[17]; and Minnesota followed with 2023 session laws, chapter 52.

Several codes still contain the offense. Georgia's section 16-6-18 remains on the books ^[4], as do South Carolina's sections 16-15-60 to 16-15-80, with their 1880 definitions ^[5], and North Carolina's 1805 cohabitation statute, now a Class 2 misdemeanor ^[3]. Mississippi keeps its unlawful cohabitation statute ^[12], Illinois punishes fornication only when it is open and notorious ^[14], and North Dakota keeps a section titled "fornication" that now reaches only sex in public or by minors ^[13].

None of these surviving texts is considered enforceable against consenting adults in private after Lawrence ^[11]. Their survival reflects the fact that only a legislature can delete a statute: a court ruling limits how a law may be applied, but it leaves the words in the code. A state-by-state overview, with penalties and current status, is available in fornication laws still on the books.

Frequently asked questions

When was fornication legalized in the US?

There was no single nationwide date. Each state decided for itself, through repeal or court rulings, and the Supreme Court's decision in Lawrence v. Texas on June 26, 2003 is generally treated as the point after which such laws cannot be enforced against consenting adults in private. Several states repealed their statutes only between 2018 and 2023.

Were fornication laws ever enforced in the 20th century?

Yes, occasionally. In New Jersey, two men acquitted of rape were convicted of fornication in the 1970s before the state Supreme Court struck down the law in 1977. In 1996, officials in Gem County, Idaho, charged about six people, including teenagers, under a fornication statute to discourage teen pregnancy.

Did the federal government ever ban fornication?

Yes, in a limited way. An 1887 act aimed at polygamy in Utah, known as the Edmunds-Tucker Act, punished fornication by an unmarried man or woman with up to six months in prison or a $100 fine. It was not a nationwide ban: morals offenses have always been mainly a matter of state law.

What is the oldest fornication law still in a state code?

Among the statutes still in force, North Carolina's is the oldest by its cited origin. General Statute 14-184 traces its history to an act of 1805 and still makes unmarried cohabitation a Class 2 misdemeanor. Georgia's fornication section cites laws of 1833 as its earliest source.

What did the Model Penal Code say about fornication?

The American Law Institute's Model Penal Code, in 1955, did not recommend criminal penalties for consensual sexual relations conducted in private. The Supreme Court cited this recommendation in Lawrence v. Texas (2003). Illinois aligned its criminal law with the code in 1961, and other states followed.

Does Lawrence v. Texas cover fornication?

Not by name, but its reasoning does. The 2003 ruling protects private, consensual intimate conduct between adults, and Justice Scalia's dissent listed fornication laws among those the decision called into question. Legal commentators, including Cornell's Legal Information Institute, consider fornication laws unenforceable as a result.

Is fornication still illegal in any state?

On paper, yes. As of October 2026, Georgia, South Carolina, North Carolina, Mississippi and Illinois still have statutes on fornication or unmarried cohabitation, and North Dakota keeps a narrow section with that name. These laws are not considered enforceable against consenting adults in private.