Yes, it is still adultery if you’ve filed for divorce. Filing paperwork does not end a marriage, and you remain legally married until a judge signs the final decree. In the roughly 33 states that still recognize fault-based divorce, a sexual relationship with a new partner during that waiting period can be treated as adultery, with real consequences for your finances, your custody case, and in some situations your criminal exposure.1Legal Information Institute. No-Fault Divorce
Filing a Petition Does Not End the Marriage
A common misconception is that filing creates some kind of legal buffer. It doesn’t. Your marriage exists at full force until the court enters a final judgment, and every obligation that comes with being married, including the expectation of sexual fidelity in states that recognize fault grounds, stays in place the entire time. Divorces can run for months, and complicated ones involving significant assets, custody disputes, or crowded court dockets can stretch past a year. Throughout that period, a sexual relationship with someone new can be treated the same as if no petition had ever been filed.
What Counts as Adultery
Adultery is generally defined as voluntary sexual intercourse between a married person and someone other than their spouse.2Legal Information Institute. Adultery That definition doesn’t carve out exceptions for separated couples or pending divorces. Some states interpret it narrowly to mean only intercourse; others take a broader view that can include other forms of sexual contact.
Proving adultery usually takes more than suspicion. Many courts look for circumstantial evidence showing both the opportunity and the inclination, such as overnight stays, romantic communications, hotel records, or witness testimony. The standard varies, but the accusing spouse generally needs something concrete.
Does the Date of Separation Matter?
Some states treat the date of separation as a meaningful dividing line, though it does not make you single. In those jurisdictions, a court may give less weight to a relationship that began after the couple physically separated and stopped living as a married couple. Post-separation conduct might not affect alimony calculations in certain states, for example, even though the marriage technically persists.
The catch is that a new relationship starting after separation can still be used as circumstantial evidence that the affair began earlier, while the couple was still living together. Courts are not naive about this, and opposing counsel will almost certainly argue the timeline proves prior infidelity. Moving out before dating someone new doesn’t guarantee protection, but it can reduce the practical impact in states that treat separation as relevant.
No-Fault vs. Fault-Based Divorce
Every state offers some form of no-fault divorce, where neither spouse has to prove the other did anything wrong. The filing spouse simply states that the marriage has broken down due to irreconcilable differences or incompatibility, and the court proceeds without examining personal behavior.1Legal Information Institute. No-Fault Divorce In a purely no-fault proceeding, adultery during the pending case is largely irrelevant to the legal outcome, though it can still create friction that makes settlement harder.
About 33 states also allow fault-based divorce, where one spouse can allege specific misconduct like adultery, cruelty, or abandonment. Fault-based filings often result in a larger share of marital property or more alimony going to the spouse who did not commit the misconduct.1Legal Information Institute. No-Fault Divorce Even in states that allow both options, a spouse who initially filed no-fault can sometimes amend the petition to add fault grounds if they discover an affair during the proceedings.
How Adultery Affects Property and Alimony
In fault-based states, proving adultery can tilt the financial outcome. Courts may award a larger share of marital assets to the non-adulterous spouse, particularly if the affair contributed to the breakdown of the marriage. The impact varies. Some states treat marital misconduct as one factor among many; others give it significant weight.
Alimony is where adultery often hits hardest. Around 22 states permit courts to consider marital fault when deciding whether to award spousal support and in what amount. A few states go further and completely bar alimony to a dependent spouse who committed adultery. Some of those same states require alimony if the higher-earning spouse was the one who strayed. Even where fault counts, alimony decisions still weigh factors like the length of the marriage, each spouse’s earning capacity, and the standard of living during the marriage.
Spending Marital Money on an Affair Partner
A particularly expensive consequence involves something lawyers call dissipation of marital assets. Spend shared money on an affair partner, whether on gifts, trips, dinners, hotel rooms, or apartment rent, and the other spouse can ask the court to account for it during property division. Courts in many states treat money spent on an extramarital relationship as a waste of marital resources, and the offending spouse’s share of the remaining assets may be reduced to compensate.
Dissipation claims rely on documentation. Bank statements, credit card records, and receipts are the typical evidence, and if a claim is filed against you, the burden often shifts to you to prove the spending was legitimate. Every dollar spent on a new relationship during a pending divorce is a dollar your spouse’s attorney will want to talk about.
How Adultery Affects Custody
Courts decide custody based on the best interests of the child, not the moral failings of a parent.3Legal Information Institute. Best Interests of the Child Adultery by itself rarely changes a custody outcome, and judges generally don’t punish a parent for an affair unless it directly harms the child in some demonstrable way.
Surrounding circumstances still matter. A parent who neglects responsibilities to spend time with a new partner, or who introduces a rotating cast of overnight guests into a child’s home environment, hands the other side ammunition for an instability argument. Judges look at the overall picture of each parent’s judgment, and an affair can color that picture even when it is not the deciding factor.
Morality Clauses
Some divorce agreements and custody orders include morality clauses that restrict romantic overnight guests when children are present. A typical clause prohibits either parent from having a romantic partner stay overnight while the children are in their care. Violating one can lead to contempt of court or a modification of custody, though courts generally require some showing that the violation actually affected the children before imposing consequences.
Criminal, Military, and Civil Exposure to Know About
Adultery remains a criminal offense in roughly 16 states. Prosecutions are rare, but the statutes are enforceable. In most of those states, adultery is a misdemeanor carrying fines and short jail sentences; a handful treat it as a felony with potential prison time measured in years and fines in the thousands. These statutes occasionally surface in contentious divorces as leverage rather than as genuine criminal complaints.
Service members face a different set of risks. Adultery is prosecutable under Article 134 of the Uniform Code of Military Justice, which covers conduct that is prejudicial to good order and discipline or brings discredit upon the armed forces.4Office of the Law Revision Counsel. 10 USC 934 – Art. 134. General Article Unlike civilian statutes, the military prosecutes these cases with some regularity. The maximum punishment includes a dishonorable discharge, forfeiture of all pay and allowances, and up to one year of confinement, with lifelong consequences for employment, veterans’ benefits, and firearm rights. Having filed for divorce or being separated from a spouse provides no safe harbor under the UCMJ.
A small number of states, roughly six, still allow the cheated-on spouse to sue the third party involved in the affair. These claims, known as alienation of affection and criminal conversation, let a spouse seek monetary damages from the person who had a sexual relationship with their husband or wife. A pending divorce does not necessarily bar them, so a new partner in one of these states can personally face a lawsuit from the other spouse.
The Practical Takeaway on Timing
You can date during a pending divorce, but every jurisdiction attaches potential consequences. Dissipation claims, risks to alimony and property division in fault states, custody complications, and for service members the threat of military prosecution all argue for waiting until the decree is signed. If waiting is not realistic, understand what is at stake in your particular state and keep the conduct discreet and responsible, especially around children.