Adultery Has Very Limited Impact on Pennsylvania Divorce
Most people expect that a spouse's infidelity will substantially affect the divorce outcome — property division, custody, support. In Pennsylvania, it largely does not. The main exception is alimony in specific circumstances. Here is the breakdown by issue:
Alimony: The One Area Where Infidelity Has Real Legal Weight
Pennsylvania's alimony statute (23 Pa.C.S. § 3701(b)(14)) specifically lists marital misconduct as a factor. Here is how it plays out in practice:
Unfaithful Spouse Requesting Alimony
When the spouse who cheated is also the one requesting alimony, the court will give significant weight to the misconduct in deciding whether to award alimony and in what amount. An attorney for the other side will specifically argue that the unfaithful spouse's misconduct should bar or reduce the alimony award.
Unfaithful Spouse Required to Pay Alimony
When the cheating spouse is the higher earner who would otherwise pay alimony, the adultery has minimal impact on the amount. The income differential still drives the analysis. The unfaithful spouse's misconduct does not significantly reduce what they owe.
Both Spouses Had Affairs
Courts typically treat mutual misconduct as offsetting — neither party's affairs significantly affect the outcome.
The practical leverage in most cases: the fact of adultery is often more useful as a settlement tool than as a litigation strategy. A spouse who cheated and knows it may be more willing to agree to reasonable terms than go through a contested hearing where their conduct is exposed.
Dissipation of Marital Assets
Adultery rarely affects property division directly — but when a cheating spouse spent significant marital funds on the affair, that dissipation can be recovered. Specific, documented expenditures matter: expensive gifts, vacations, renting an apartment for the affair partner, transferring marital funds. Vague accusations of "wasted money" without specific amounts and documentation do not move courts.
Pros, Cons, and the Practical Reality
The case for filing on adultery grounds: Pennsylvania allows divorce based on fault grounds including adultery (23 Pa.C.S. § 3301(a)). A fault-based divorce does not require waiting for the one-year separation period — it can proceed after the mandatory 90-day minimum. If your spouse will not consent to a no-fault divorce, adultery grounds give you a path forward without waiting.
The case against: Proving adultery requires evidence of a sexual relationship — photographs, texts, hotel receipts, witness testimony. Gathering that evidence is expensive, makes the case more contentious, and rarely changes the financial outcome anyway. Children may learn the details of the affair through court proceedings. And now that the contested separation period is only one year (reduced from two years in December 2016), the timeline advantage of fault grounds is smaller than it used to be.
The most common practical approach: Use knowledge of the adultery as leverage in settlement negotiations rather than litigating fault grounds. Get a better settlement by implicitly or explicitly signaling that you are prepared to litigate fault if the other side is unreasonable.