1. Which States Still Allow Lawsuits against an Affair Partner?
Most U.S. .tates have abolished both primary tort claims directed at third parties by statute or court decision. As of this writing, roughly six to eight states still recognize at least one, with North Carolina maintaining the most active case law and the largest documented jury verdicts.
States That Still Recognize These Claims
Hawaii, Mississippi, New Mexico, South Dakota, and Utah also allow one or both claims. Each state applies its own elements, statute of limitations, and damage rules, so availability in one state says nothing about the next.
What about New York and Washington, D.C.?
New York abolished these tort actions decades ago, and its adoption of no-fault divorce in 2010 confirmed the same legislative direction. Washington, D.C. .s in the same position. If you are in New York, the available remedies run through the divorce itself, not a separate tort suit. A matrimonial and family law attorney can explain how fault evidence functions in your specific proceedings.
2. Criminal Conversation: What the Claim Requires
Despite the name, criminal conversation has nothing to do with talking. It is a civil tort based on the act of sexual intercourse itself, and courts in states that still allow it treat the claim as close to strict liability.
The Two Elements a Plaintiff Must Prove
A plaintiff must show that a valid marriage existed at the time and that the defendant had sexual intercourse with the plaintiff's spouse. The unfaithful spouse's consent is not a defense, and there is no need to prove the affair partner pursued the relationship or caused the marriage to fail.
What Evidence Courts Accept
Hotel records, cell phone data, physical evidence, and eyewitness accounts have all been used to establish the underlying conduct. The standard is preponderance of the evidence. These claims are specialty torts with state-specific procedural rules, and local experience matters.
3. Alienation of Affection: a Harder Case to Make
Alienation of affection does not require proof of a sexual act. The claim is based on interference with the marital relationship itself, which makes causation the central and most contested element.
The Three Things a Plaintiff Must Establish
A plaintiff must prove a loving marriage existed before the defendant's conduct, that the defendant caused the loss of that affection, and that the defendant acted with intent to interfere. Proof of an affair is strong supporting evidence, but the claim demands that the third party's actions drove the breakdown, not that they simply coincided with a declining marriage.
The Defense That Defeats Most Cases
The strongest defense is that the marriage was already failing before the defendant became involved. If a spouse can show the couple had been living separately or discussing divorce beforehand, the causation element collapses. North Carolina juries have returned multi-million-dollar verdicts in successful cases, though appellate courts have reduced some of those awards on review.
4. How These Two Claims Compare
| Criminal conversation | Alienation of affection | |
| Proof of sexual act | Required | Not required |
| Intent element | None (strict liability) | Required |
| Strongest defense | Statute of limitations | Marriage was already failing |
| Damages | Compensatory and punitive | Compensatory and punitive |
| Primary challenge | Proving the act occurred | Proving causation |
Proof of sexual act
- Criminal conversationRequired
- Alienation of affectionNot required
Intent element
- Criminal conversationNone (strict liability)
- Alienation of affectionRequired
Strongest defense
- Criminal conversationStatute of limitations
- Alienation of affectionMarriage was already failing
Damages
- Criminal conversationCompensatory and punitive
- Alienation of affectionCompensatory and punitive
Primary challenge
- Criminal conversationProving the act occurred
- Alienation of affectionProving causation
5. Adultery and Alimony: Where the Two Cases Intersect
A tort suit against an affair partner is a separate proceeding from seeking spousal support in a divorce, but the evidence they draw on often overlaps. Running both without coordination creates real risk.
How Infidelity Findings Carry into Support Awards
In states that treat adultery as a fault ground, proof of infidelity can increase the alimony award for the betrayed spouse. It can also reduce the adulterous spouse's entitlement to support. New York courts have discretion to consider marital fault in maintenance awards, though the weight any particular judge gives it varies by the severity of the conduct.
The Double-Recovery Problem
Courts generally will not allow a plaintiff to recover twice for the same harm, once in a tort action and again in the divorce proceeding. Damages collected from the affair partner may factor into how a judge approaches distribution or support. Coordinating both proceedings from the start avoids that complication.
6. Is Filing Worth It?
Suing an affair partner is an independent civil action with its own filing fees, discovery obligations, and attorney fees. It runs entirely separate from the divorce and subject to its own procedural demands. The decision to file turns on where you live, the strength of your evidence, and the defendant's financial position.
The Real Costs before You Decide
Contested cases in states like North Carolina routinely take two to three years to resolve. Courts require corroborating evidence, as testimony alone does not establish either claim. Civil proceedings are also public record, which means the details of the affair become accessible to anyone who searches court filings.
When the Divorce Is the Better Path
A judgment only matters if the defendant can pay it. For many clients, the more efficient approach runs through the divorce proceeding itself. Evidence of adultery can influence property division and support without the cost or public exposure of a separate tort action.
7. Frequently Asked Questions
Can I sue my spouse's affair partner in New York?
No. New York abolished both criminal conversation and alienation of affection as independent tort claims. Evidence of adultery is relevant in New York divorce proceedings, particularly on the question of maintenance, but it does not support a separate lawsuit against the affair partner.
What is the difference between criminal conversation and alienation of affection? C
Riminal conversation is based on the sexual act itself and requires no proof of intent. Alienation of affection is based on interference with the marital relationship and requires proof that the defendant caused its breakdown.
07 Jul, 2025
