Is Adultery Illegal in Oklahoma? Criminal Law and Divorce Effects

Yes, adultery is illegal in Oklahoma. It is classified as a felony punishable by up to five years in prison, a fine of up to $500, or both.¹ In practice, nobody is prosecuted for it. Where the law still bites is in divorce court, where an affair can affect property division, alimony, and occasionally custody.

What the Criminal Statute Says

Oklahoma defines adultery as voluntary sexual intercourse between a married person and someone who is not their spouse.² When only one of the two people involved is married, both are considered guilty under the statute. The offense is a Class D1 felony, carrying up to five years of imprisonment, a fine of up to $500, or both.¹

The felony classification surprises most people. So does the small fine, which has not been updated since the statute was written.

Who Can File a Complaint

Not just anyone can trigger a prosecution. Only the spouse of one of the people involved can file a criminal complaint. The exception is “open and notorious” adultery: if the couple is living together openly and making no effort to hide the relationship, any person may file.²

Why Nobody Actually Gets Charged

Criminal enforcement effectively ended decades ago. District attorneys have wide discretion over which cases to bring, and no Oklahoma prosecutor is going to spend resources on an adultery charge. There is also a constitutional cloud over the statute. The U.S. Supreme Court’s 2003 decision in Lawrence v. Texas held that the government cannot criminalize consensual sexual conduct between adults in a private home.³ No Oklahoma court has formally struck down the adultery statute, but anyone actually charged would likely raise a constitutional defense. The law survives because no one has tested it.

Where Adultery Actually Matters: Divorce

The real consequences of infidelity in Oklahoma play out in family court. Oklahoma allows both no-fault and fault-based divorce. You can file on the no-fault ground of “incompatibility” without proving wrongdoing, but the statute also lists adultery among the fault-based grounds.⁴

Filing on adultery grounds is a strategic choice. It requires you to prove the affair, which adds time and expense. Direct proof like a photograph or confession is ideal but not required. Courts accept circumstantial evidence: text messages, hotel receipts, unexplained absences, financial records showing gifts or trips, and testimony from people who saw suspicious behavior. The evidence has to be strong enough to convince a judge the affair more likely than not occurred.

A fault-based filing does not guarantee a larger property share or automatic alimony. If the infidelity had no financial impact on the marriage, it may just run up legal bills without changing the result.

Property Division

Oklahoma is an equitable distribution state. When a marriage ends, the court divides jointly acquired property in whatever manner it considers “just and reasonable,” which does not necessarily mean a 50/50 split.⁵ Each spouse keeps property owned before the marriage. Everything acquired during the marriage gets divided based on the circumstances.

The affair itself does not automatically entitle the faithful spouse to a bigger share. What moves the needle is spending. If the cheating spouse drained joint accounts on hotel rooms, gifts, vacations, or an apartment for the affair partner, a judge can treat that as dissipation of marital assets and offset it by awarding the other spouse a larger portion of what remains. Bank statements, credit card records, and payment-app transactions showing money flowing to the affair partner are the kind of evidence that shifts a property division.

Alimony

Oklahoma courts have broad discretion in awarding alimony. The statute lets either spouse receive “such alimony out of real and personal property of the other as the court shall think reasonable.”⁵ The driving factors are financial: one spouse’s need, the other’s ability to pay. Marital misconduct can be part of the analysis, but a judge is not going to award alimony purely to punish someone for cheating. If the cheating spouse is also the lower-earning spouse who needs support, they can still receive it.

One scenario trips people up. If the spouse receiving alimony later begins living with a new romantic partner, the paying spouse can ask the court to terminate or reduce payments based on that cohabitation.⁶ The paying spouse must file a motion and show the cohabitation has actually changed the recipient’s financial situation.

Custody

Adultery by itself rarely changes a custody outcome. Oklahoma courts decide custody based on the best interest of the child, and an affair between adults is not, by default, relevant to parenting ability. A parent who cheated on a spouse is not automatically a bad parent.

What changes the analysis is when the affair directly affected the children:

The children were exposed to the relationship, raising questions about the parent’s judgment.
The affair partner has a violent criminal history, substance abuse problems, or has harmed the children.
The affair destabilized the children’s living situation, for example by leaving them unsupervised or redirecting family resources away from them.

Outside those circumstances, raising adultery in a custody fight tends to look vindictive. Family courts focus on what arrangement serves the children going forward, not on punishing a spouse for past behavior.

You Cannot Sue the Affair Partner

Some states still let a betrayed spouse sue the other person involved in the affair under theories called “alienation of affections” or “criminal conversation.” Oklahoma does not. The state abolished alienation of affections by statute.⁷ You cannot recover money damages from the affair partner regardless of how much harm they caused the marriage. Your legal remedies are limited to the divorce itself.