Adultery is voluntary sexual intercourse between a married person and a person who is not his or her spouse. Adultery is a leading cause of divorce, and in some states may be relevant in determining who was at fault for the breakup of the marriage, and whether the innocent spouse is entitled to an unequal division of the assets.
In Oregon, adultery is not treated as a criminal offense, and the state follows a 'no-fault' divorce system. This means that a divorce can be granted without the need to prove wrongdoing by either spouse. The court does not consider marital misconduct, such as adultery, when determining the division of marital property or awarding spousal support. Instead, the division of assets is typically based on principles of equitable distribution, which aim to divide property fairly, though not necessarily equally, between the spouses. As such, the fact that one spouse has committed adultery will generally not affect the division of assets or the awarding of spousal support in an Oregon divorce proceeding.