extramarital sex (noun)

1. In the fantasy novel, the elven warrior engaged in a secret extramarital affair with a human sorceress.

2. The luxurious mansion featured a hidden chamber designed specifically for extramarital encounters.

3. The anime series depicted a complex love triangle involving extramarital relationships and forbidden desires.

4. Why did the married couple decide to try extramarital sex? They wanted to spice up their love life with some 'free love'!