By Legal Radar 
Discovering a spouse’s affair often brings a flood of questions beyond the emotional pain. One of the first is practical and urgent: is it illegal to cheat on your spouse? The short answer is that it depends on where you live. In most of the country, adultery is not a crime, yet a minority of states still keep old criminal statutes on the books. Even where those laws exist, prosecutors almost never bring charges. The real legal consequences usually appear in divorce court, where marital misconduct can influence spousal support, property division, and, in limited cases, parenting arrangements.
This guide explains the current criminal status of adultery across the United States, the difference between criminal and civil consequences, how no-fault and fault-based divorce systems treat infidelity, and practical steps for people navigating these issues. The goal is clarity during a difficult time, not judgment.
What Counts as Adultery Under the Law?
Adultery generally means voluntary sexual intercourse between a married person and someone who is not their spouse. Some statutes use broader language covering other sexual conduct. Definitions vary by state, and a few older laws still contain gender-specific wording, though most have been updated to be gender-neutral.
Criminal statutes typically require proof of sexual intercourse. Emotional affairs, texting, or dating without sex usually fall outside criminal definitions, though they can still matter in divorce proceedings under the broader concept of marital misconduct.
Is Adultery a Crime? The Current State of Criminal Laws
No federal law makes adultery a crime for civilians. Criminal authority rests with the states. As of 2026, roughly 15 states still classify adultery as a criminal offense. Three treat it as a felony. The rest classify it as a misdemeanor. Prosecutions are extraordinarily rare. District attorneys almost never pursue these cases because of limited resources, privacy concerns, proof difficulties, and constitutional questions raised by cases such as Lawrence v. Texas.
States Where Adultery Remains a Felony
- Michigan: Felony with potential prison time and fines under general sentencing rules.
- Oklahoma: Felony punishable by up to five years in prison, a fine of up to $500, or both. The statute can apply to both the married person and the other participant.
- Wisconsin: Class I felony carrying up to three and a half years in prison and a fine of up to $10,000. Both the married person and their partner can face charges.
States Where Adultery Is a Misdemeanor
Commonly listed states include Alabama, Arizona, Florida, Georgia, Illinois, Kansas, Maryland, Mississippi, North Carolina, North Dakota, South Carolina, and Virginia. Penalties range from small fines to short jail terms, sometimes only if the conduct is “open and notorious” or involves cohabitation. Florida, for example, targets living in an “open state of adultery.” Illinois has similar language.
Recent repeals show a clear trend. Idaho removed its statute in 2022, Minnesota in 2023, and New York in late 2024. Rhode Island’s criminal provision was addressed in 2025-2026 legislative changes, with reports indicating repeal effective mid-2026. Always check current statutes, as legislatures continue to modernize these laws.
Even in states that still criminalize adultery, actual jail time for cheating on a spouse almost never happens. The statutes function more as historical remnants than active enforcement tools.
Military Rules Are Different
Service members face a separate set of rules under the Uniform Code of Military Justice. Extramarital sexual conduct (formerly called adultery) falls under Article 134. It is not automatic. Prosecutors must show the conduct was prejudicial to good order and discipline or brought discredit on the armed forces. Maximum authorized punishment includes a dishonorable discharge, forfeiture of all pay and allowances, and confinement for up to one year. Most cases are handled administratively through counseling, reprimands, nonjudicial punishment, or adverse evaluations rather than full court-martial. Careers can still suffer serious damage.
Civil Consequences: How Cheating Affects Divorce
Criminal charges are rare. Divorce court is where most people encounter legal consequences of infidelity. Every state now offers no-fault divorce, meaning a spouse can end the marriage by citing irreconcilable differences or an irretrievable breakdown without proving wrongdoing. Many states also retain fault-based grounds, and adultery is one of the most common.
Fault-Based vs. No-Fault Systems
In pure no-fault states such as California, Colorado, Florida (for grounds), and others, courts generally do not assign blame for the breakdown of the marriage. Evidence of specific acts of misconduct may even be inadmissible for certain purposes. In states that still allow fault filings, proving adultery can affect financial outcomes.
Impact on Spousal Support (Alimony)
This is the area with the widest variation.
- In some states, a spouse who committed adultery may be barred from receiving alimony or face a reduced award, especially if the adultery caused the divorce.
- In others, marital misconduct is simply one factor among many (need, ability to pay, length of marriage, standard of living).
- Pure no-fault jurisdictions often prohibit courts from considering fault when setting support. California Family Code § 4320, for example, lists numerous economic factors but does not include adultery.
Even in no-fault states, financial misconduct tied to the affair can matter. If a spouse spent substantial marital funds on hotels, gifts, travel, or support for a third party, the other spouse may seek reimbursement through a dissipation of assets claim. Courts treat that spending as a waste of community or marital property.
Division of Marital Assets
Most states use equitable distribution (fair, not necessarily equal) or community property rules. Adultery itself rarely changes the overall division formula. Dissipation claims are the main exception. Documented spending on an affair can lead a court to credit the innocent spouse with a larger share of remaining assets to offset the waste.
Child Custody Determinations
Courts decide custody under the best interests of the child standard. An affair alone almost never decides who receives primary custody or how parenting time is allocated. Judges focus on the child’s stability, safety, emotional needs, and relationship with each parent. The affair becomes relevant only if it directly harmed the child, for example by exposing the child to an unsafe environment, introducing a partner who poses a risk, or causing significant disruption to the child’s routine and emotional well-being.
Can You Sue the Person Your Spouse Cheated With?
Most states abolished the old “heart balm” torts decades ago. A small number still allow civil lawsuits against a third party for interfering with the marriage.
Alienation of affection lets a spouse sue someone who intentionally destroyed the love and affection in the marriage. Proof of sexual intercourse is not always required.
Criminal conversation is a civil claim focused specifically on sexual intercourse with a married person. Despite the name, it is not a criminal charge.
As of 2026, the states that still recognize one or both claims are primarily Hawaii, Mississippi, North Carolina, South Dakota, and Utah (with Utah’s abolition scheduled to take effect in 2027). North Carolina remains the most active jurisdiction and has produced some of the largest verdicts. New Mexico abolished the tort in early 2026. These cases are separate from divorce proceedings and target the third party for money damages. Success is not guaranteed, and the trend continues toward abolition.
Real-World Scenarios and Practical Considerations
Consider two common situations.
In a pure no-fault state such as California, a spouse discovers an affair and wants to “punish” the other through the divorce. The court will not increase alimony or shift property solely because of the cheating. If the unfaithful spouse spent $40,000 of community funds on the affair, however, the other spouse can seek reimbursement. Custody turns on the children’s needs, not the affair itself.
In a state that still allows fault-based divorce and considers marital misconduct in support decisions, the same facts can produce a different financial outcome. The innocent spouse may receive higher or longer support, and the court may view the affair as relevant to the overall fairness of the property division.
Evidence matters. Text messages, hotel receipts, financial records, and witness statements can support dissipation claims or fault grounds. Gathering evidence must stay within legal bounds. Illegal recording or hacking can create separate liability and may be excluded from court.
When to Consult a Family Law Attorney
Laws change, and local practice varies. Anyone facing separation or divorce after an affair benefits from speaking with a family law attorney licensed in the relevant state. An attorney can explain whether fault grounds are available, how local judges typically treat marital misconduct, what evidence is useful, and how to protect financial and parenting interests. Early advice often prevents costly missteps.
Military members should consult a military defense attorney or JAG officer about potential UCMJ exposure in addition to any civilian divorce counsel.
Key Takeaways
Is it illegal to cheat on your spouse? In most of the United States the answer is no. A minority of states still maintain criminal statutes, three of them treating adultery as a felony, but prosecutions are almost nonexistent. The practical consequences appear in divorce: possible effects on spousal support, reimbursement for wasted marital funds, and limited relevance to custody when the child’s welfare is affected. A handful of states still allow civil suits against a third party. Military rules impose additional risks for service members.
Infidelity is primarily a personal and relational crisis. The law provides tools for sorting out financial and parenting issues after a marriage ends, not for assigning moral blame in most jurisdictions. Clear information and competent legal advice help people move forward with realistic expectations.
If you are navigating these issues, consult a qualified family law attorney in your state to understand how the rules apply to your specific situation.
Frequently Asked Questions
Can you go to jail for cheating on your spouse?
In theory, yes in the handful of states that still treat adultery as a crime, especially the three felony jurisdictions. In practice, civilian prosecutions are vanishingly rare. Military service members face greater risk under the UCMJ if the conduct affects good order or the reputation of the armed forces.
Is adultery a crime in all 50 states?
No. The majority of states have repealed criminal adultery laws or never enforced them in modern times. Roughly 15 states retain statutes as of 2026.
How does cheating affect divorce settlements?
It depends on the state. In pure no-fault jurisdictions the direct impact is usually limited to dissipation claims for money spent on the affair. In states that consider fault, adultery can influence alimony and, less commonly, property division. Custody turns on the child’s best interests.
Is cheating on your spouse illegal in California?
No. California does not criminalize adultery. As a pure no-fault state, the courts generally do not consider marital misconduct when dividing property or setting spousal support, except for financial dissipation or direct harm to children.
Can you sue someone for cheating with your spouse?
Only in a small number of states that still recognize alienation of affection or criminal conversation. Most states abolished these claims long ago.
Does cheating impact alimony payments?
Sometimes. Some states bar or reduce support for an adulterous spouse. Others treat it as one factor or ignore it entirely. Always check the specific state statute and case law.
What should I do if I discover an affair?
Document relevant financial records carefully and within legal limits. Avoid illegal surveillance. Speak with a family law attorney promptly to understand your options regarding separation, temporary support, and asset protection.
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