Adultery Meaning and Legal Effects by State

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Contents

The legal definition is narrower than everyday infidelity
Adultery may be a divorce ground even when no-fault divorce is available
Support can depend on who engaged in the conduct and when
Property and parenting require their own analysis
Proof and defenses can matter as much as the definition
A criminal statute is separate from divorce law
Civil claims against another person are a separate subject
Sources

Key Facts

State level: Adultery generally concerns voluntary sexual conduct outside a marriage, but the governing statute determines the precise definition.
State level: A divorce ground, an alimony rule, a property claim, and a criminal offense are separate legal questions.
Virginia state level: The current adultery ground for divorce concerns conduct before the parties’ last separation.
New York state level: The adultery crime was repealed in 2024, while adultery remains a statutory divorce ground.

Adultery generally means voluntary sexual conduct involving a married person and someone other than that person’s spouse. Its legal significance depends on the state, the conduct covered by the applicable definition, and the issue being decided.

The law does not treat ending a marriage, deciding support, dividing property, and prosecuting a crime as one question. New York illustrates the distinction particularly clearly: its legislature removed the criminal adultery offense, but its divorce statute still recognizes adultery.

The legal definition is narrower than everyday infidelity

New York’s current divorce definition covers vaginal, oral, or anal sexual contact voluntarily performed with someone other than the spouse after the marriage. Oklahoma’s criminal definition instead uses older language referring to voluntary sexual intercourse by a married person with someone of the opposite sex.

Neither of those definitions makes an emotional attachment or romantic message, standing alone, the required sexual act. That does not establish what weight a message might have as evidence of other conduct; a definition and proof of its elements are different questions.

The examples also show why a definition from a criminal code cannot simply be substituted into another state’s divorce law. This overview compares civilian family-law and state criminal provisions; it does not address the separate military justice system.

Adultery may be a divorce ground even when no-fault divorce is available

California permits dissolution based on irreconcilable differences causing an irremediable marital breakdown or permanent legal incapacity to make decisions. Adultery is not a separate ground in that statute.

New York retains an adultery ground alongside irretrievable breakdown for at least six months, stated under oath by one party. Its breakdown provision also requires the specified financial and child-related issues to be resolved before a divorce judgment is granted.

Virginia’s current statute permits divorce for adultery that occurred before the date of the parties’ last separation. It separately permits a separation-based divorce after one year without cohabitation or interruption, reduced to six months when the parties have a separation agreement and no minor children of the categories specified in the statute.

In these statutes, a no-fault ground removes the need to prove adultery as the reason for ending the marriage; it does not supply a complete answer to every financial issue. The broader divorce law guide explains the other questions a divorce case can involve.

Support can depend on who engaged in the conduct and when

Virginia generally bars permanent spousal support from a spouse who has an adultery ground for divorce against the spouse seeking support. The court may nevertheless award support if clear and convincing evidence shows that denying it would create a manifest injustice, considering both spouses’ degrees of fault during the marriage and their relative economic circumstances.

North Carolina uses the term illicit sexual behavior for specified voluntary sexual acts with someone other than the spouse. Its alimony rules distinguish a dependent spouse—one substantially dependent on or in need of support—from the supporting spouse.

Under North Carolina’s alimony statute, qualifying conduct by only the dependent spouse during the marriage and before or on the separation date bars an alimony award. Qualifying conduct by only the supporting spouse during that period requires alimony to be paid to a dependent spouse.

If both spouses engaged in that conduct, the court may award or deny alimony after considering all the circumstances. Conduct condoned by the other spouse is excluded from this analysis.

Even when entitlement follows from that rule, the amount and duration remain subject to the statutory factors and the court’s discretion. North Carolina also permits a performed, valid marital or separation agreement with an express support provision to bar alimony under its agreement rule.

These are alimony rules, not a formula for child support or ownership of the family home. The alimony overview explains how spousal support differs from other financial orders.

Property and parenting require their own analysis

Virginia’s property statute requires the court to consider the circumstances contributing to the marriage’s dissolution, including the listed fault grounds. It also separately addresses spending marital property for a nonmarital purpose or dissipating funds in anticipation of divorce or separation or after the last separation.

That makes the financial use of marital assets a distinct issue from whether adultery occurred. The statute calls for consideration of multiple factors, including contributions, debts, and the marriage’s duration, rather than an automatic transfer of all property because one spouse had an affair.

Custody presents a different question again. California’s best-interests statute directs courts to consider the child’s health, safety, and welfare, abuse history, contact with both parents, and specified substance-use concerns, along with other relevant factors consistent with state policy.

An allegation of an affair does not replace that child-centered inquiry. Conduct affecting a child’s safety or welfare raises a different issue from a label describing a spouse’s relationship.

Proof and defenses can matter as much as the definition

Virginia does not permit an adultery-based divorce on the spouses’ uncorroborated testimony alone. Its statute also requires the case to be heard independently of admissions in pleadings or otherwise; the corroboration rule has an express exception for separation-based divorce.

Virginia also bars an adultery-based divorce when the parties voluntarily cohabited after learning of the conduct, when it occurred more than five years before the suit, or when the accusing spouse procured or connived in it. Those limits concern the particular divorce ground, not a nationwide deadline for every claim connected to an affair.

California takes a different approach to marital misconduct evidence in dissolution and legal-separation proceedings. Unless another statute provides otherwise, evidence of specific acts of misconduct is improper and inadmissible, including in depositions and discovery.

These rules explain why “proof of cheating” is not a self-contained legal test. The relevant inquiry includes the claim being made, the required conduct, the timing, and the evidence rules for that proceeding.

A criminal statute is separate from divorce law

New York repealed Penal Law section 255.17 effective November 22, 2024. The repeal removed that crime; it did not remove adultery from Domestic Relations Law section 170.

Oklahoma’s published code still defines an adultery offense. Its current penalty provision classifies it as a Class D1 felony and states a maximum of five years in prison, a fine of up to $500, or both.

Oklahoma generally restricts who may commence and carry on a prosecution to a spouse of either participant, while allowing any person to complain when people live together in open and notorious adultery. Those statutory provisions do not establish how frequently prosecutions occur or resolve whether a particular application would survive a constitutional challenge.

In Lawrence v. Texas, the Supreme Court invalidated a Texas criminal prohibition applied to private, consensual sexual conduct between two adults of the same sex. The Court expressly distinguished situations involving minors, coercion, public conduct, and prostitution.

That decision was not a ruling on the Oklahoma adultery statute or a repeal of state divorce grounds. A criminal-law answer therefore requires distinguishing the statute’s text, the applicable constitutional rule, and the particular conduct at issue.

Civil claims against another person are a separate subject

North Carolina’s statute governing alienation of affection and criminal conversation limits actions to natural persons, meaning individuals rather than companies. Despite its name, the provision addresses a civil cause of action for criminal conversation, not the Oklahoma criminal offense.

Under that North Carolina statute, acts after the spouses physically separate with either spouse intending the separation to remain permanent cannot give rise to those causes of action. An action must not begin more than three years after the defendant’s last act giving rise to the claim.

Those procedural limits do not by themselves establish that a claim’s substantive elements have been proved. They also illustrate why a rule about separation in one kind of case cannot be treated as permission covering every other legal issue.

The key distinction is between conduct, proof, and consequence: a state can recognize adultery for one legal purpose while treating another issue under a different standard. The examples above explain those boundaries without turning one state’s rule into a national result.