Illicit intercourse is a term used to describe sexual activity that is considered illegal or immoral. There are many different synonyms for this phrase that can be used in various contexts. Some alternative phrases include unlawful sex, forbidden romance, clandestine affair, illicit rendezvous, immoral liaisons, and consensual non-monogamy. These terms can be used to refer to any type of sexual activity that is considered outside of the traditional boundaries of monogamy or marriage. Whether it involves multiple partners, extramarital affairs, or other forms of non-traditional relationships, this type of behavior is often viewed with suspicion or disapproval in mainstream society. Regardless of the term used, it's important to remember that sexual behavior should always be consensual and respectful of all parties involved.