Fornicating is a word that refers to engaging in sexual intercourse outside of marriage. Some synonyms for fornicating include copulating, coupling, mating, bedding, and having sex. Other synonyms that could be used include hooking up, making love, romping, and shagging. It is important to note that using the right synonym depends on the context of the sentence or phrase being used. Some synonyms may be more appropriate for a romantic setting, while others may be better suited for a more casual or vulgar context. Regardless of the synonym used, it is important to remain respectful towards others when discussing topics related to sex and intimate relationships.