The term "adulterous affair" can be replaced with a variety of different phrases and words that reflect the same meaning. Some synonyms for an adulterous affair include "cheating," "infidelity," "affair," "illicit relationship," "extramarital relations," or "unfaithfulness." Each of these terms reflects the idea of one or both partners in a romantic relationship engaging in sexual behavior with another person outside of their partnership. While the words used to describe these actions may differ, the implications of an adulterous affair are often similar: betrayal, heartbreak, and a loss of trust within the relationship.