unlawful carnal knowledge

English Thesaurus

1. forbidden or tabu sexual intercourse between individuals (noun.act)

hypernym	:	carnal knowledge, coition, coitus, congress, copulation, intercourse, relation, sex act, sexual congress, sexual intercourse, sexual relation,
definition	:	the act of sexual procreation between a man and a woman; the man's penis is inserted into the woman's vagina and excited until orgasm and ejaculation occur (noun.act)

hyponym	:	extramarital sex, free love,
definition	:	sexual intercourse between individuals who are not married to one another (noun.act)

hyponym	:	incest,
definition	:	sexual intercourse between persons too closely related to marry (as between a parent and a child) (noun.act)