extramarital sex

English Thesaurus

1. sexual intercourse between individuals who are not married to one another (noun.act)

hypernym	:	criminal congress, unlawful carnal knowledge,
definition	:	forbidden or tabu sexual intercourse between individuals (noun.act)

hyponym	:	adultery, criminal conversation, fornication,
definition	:	extramarital sex that willfully and maliciously interferes with marriage relations (noun.act)

hyponym	:	fornication,
definition	:	voluntary sexual intercourse between persons not married to each other (noun.act)