Adultery still matters in a New York divorce. It remains a fault-based ground under Domestic Relations Law 170(4), and in narrow circumstances it can shift how a judge divides marital property, sets spousal maintenance, or structures custody. But proving adultery is hard, the defenses are broad, and most people who could file on that ground end up filing no-fault instead. New York repealed the criminal adultery statute on November 22, 2024, but that repeal has no effect on divorce law, which is governed separately.1New York State Senate. Senate Bill S8744
What Counts as Adultery Under New York Divorce Law
Domestic Relations Law 170(4) defines adultery more broadly than the everyday meaning of the word. It covers vaginal, oral, and anal sexual contact performed voluntarily with someone other than the plaintiff spouse during the marriage.2New York State Senate. New York Domestic Relations Law 170 – Action for Divorce The conduct has to be voluntary, so coerced contact does not qualify, and it has to occur while the marriage is still legally in place.
Why Adultery Is Hard to Prove
Two rules make an adultery-based divorce far harder to win than most people expect.
First, under CPLR 4502(a), a spouse is not competent to testify against the other in a case founded on adultery. You cannot take the stand and tell the judge that your spouse cheated. The narrow exceptions allow spousal testimony only to prove the marriage exists, to disprove the adultery, or to rebut a defense once the other side has opened the door.3New York State Senate. New York Civil Practice Law and Rules Law 4502 – Spouse The New York courts website confirms that adultery “can be hard to prove because evidence from someone besides the Plaintiff and spouse is needed.”4NYCourts.gov. Residency and Grounds for a Divorce
Second, courts require corroborating evidence. An accusation supported only by the plaintiff’s belief will not survive. Judges expect independent proof: third-party witnesses, surveillance, financial records, or documented communications. That standard exists because courts have long been wary of fabricated adultery claims.
Defenses That Can Defeat an Adultery Claim
Even when the affair happened and can be proven, Domestic Relations Law 171 gives the accused spouse several defenses that block the divorce on that specific ground.5New York State Senate. New York Domestic Relations Law 171 – When Divorce Denied, Although Adultery Proved
- Condonation, or forgiveness. If you knew about the affair and voluntarily continued living with your spouse, a court can treat that as forgiveness and deny the divorce on adultery grounds.
- Recrimination. If you also committed adultery, the court can refuse to grant divorce on a ground you are equally guilty of.
- Connivance. If you procured, encouraged, or set up the adultery, the claim fails.
- A five-year time limit. You cannot file on adultery grounds if more than five years have passed since you learned about the affair.
None of these defenses prevents divorce altogether. They only close off the adultery ground. You can still proceed no-fault or on another fault-based ground.
How Adultery Affects Property Division
New York is an equitable distribution state, meaning marital property is divided based on what is fair, not automatically 50/50. Adultery by itself does not tilt that analysis. A judge will not hand one spouse a larger share of the assets simply to punish the other for cheating.
The one place adultery does move the needle is when marital money was spent on the affair. Under DRL 236(B), wasteful dissipation of marital property is an explicit factor in equitable distribution. Hotel bills, vacations with the affair partner, expensive gifts, and joint-card charges tied to the relationship all count. When that spending is documented, a court can credit the innocent spouse with a larger share of the remaining assets to offset the waste.
The distinction is worth holding on to: the affair itself is not the issue for property purposes. The financial misconduct connected to the affair is. A spouse who cheated but did not spend marital funds on it will see little to no property impact.
How Adultery Affects Spousal Maintenance
Spousal maintenance is calculated under DRL 236(B) using statutory guidelines. When income exceeds the statutory cap or a judge departs from the formula, the court weighs 15 factors, including the length of the marriage, each spouse’s income and earning capacity, and the marital standard of living.6NYCourts.gov. 15 Factors for Post-Divorce Maintenance
Adultery is not on that list. Courts generally refuse to raise or lower maintenance because of an affair. A cheating spouse is not automatically ordered to pay more, and an unfaithful lower-earning spouse is not automatically cut off from support.
Two of the statutory factors can still bring affair-related conduct into the maintenance calculation. Wasteful dissipation of marital property is one, for the same reasons it matters in property division. Acts by one spouse that inhibited the other’s earning capacity is another. Ordinary infidelity does not meet that bar; the misconduct has to be extreme, and courts rarely find it absent something like financial fraud or serious abuse intertwined with the affair.
How Adultery Affects Custody
Custody in New York is decided under the best interests of the child standard in DRL 240. On its own, a parent’s affair has essentially no bearing on custody. Courts do not treat infidelity as evidence of bad parenting.
What matters is whether the surrounding circumstances affected the child. If a parent introduced the affair partner in a way that destabilized the children, if the affair led to neglected parental responsibilities, or if it produced hostility the children were exposed to, those facts can weigh on the analysis. The lens is always the child’s experience.
There is no standard morality clause in New York custody orders. A judge can restrict overnight guests during parenting time after a hearing if the evidence supports it, but those restrictions are case-specific and uncommon. The children’s ages, how a new partner was introduced, and whether the situation creates instability all factor in.
Gathering Evidence Without Undermining Your Case
Because you cannot testify to the adultery yourself, an adultery-based case rises or falls on outside proof. The evidence that carries weight tends to fall into three categories:
- Surveillance and photographs. Private investigators are commonly hired for matrimonial cases, and their footage, photos, and written reports can place a spouse with a specific person at specific times and locations.
- Financial records. Credit card statements, bank transactions, and cash withdrawals often reveal spending patterns tied to an affair: hotels, restaurants, gifts, and travel.
- Digital communications. Text messages, emails, and social media exchanges can be powerful, but how you obtained them matters enormously.
Evidence gathered illegally is inadmissible and can create legal exposure for the spouse who collected it. Hacking into a spouse’s phone, email, or social media can violate the federal Wiretap Act, which prohibits unauthorized interception of electronic communications.7Office of the Law Revision Counsel. 18 USC 2511 – Interception and Disclosure of Wire, Oral, or Electronic Communications Prohibited New York’s own eavesdropping laws add another layer. A spouse who cuts corners on collection can lose the evidence and face criminal or civil liability of their own.
When Filing on Adultery Grounds Is Worth It
New York’s no-fault ground under DRL 170(7) requires only a sworn statement that the marriage has broken down irretrievably for at least six months, along with resolution of all economic and custody issues.2New York State Senate. New York Domestic Relations Law 170 – Action for Divorce Nobody has to prove wrongdoing.
An adultery filing means litigating whether the affair happened, satisfying the corroboration and testimony rules, and defending against the DRL 171 defenses. The process runs longer and costs more. For most people, no-fault is the better route.
The situations where fault-based filing may still make strategic sense tend to involve significant marital assets combined with clear evidence of dissipation tied to the affair, or a need to move forward without waiting out the six-month irretrievable breakdown period. A family law attorney can evaluate whether the added cost is likely to produce a meaningfully better result in a specific case.