fornicate
From Longman Dictionary of Contemporary Englishfornicatefor‧ni‧cate /ˈfɔːnɪkeɪt $ ˈfɔːr-/ verb [intransitive] SYSEX/HAVE SEX WITHa word meaning to have sex with someone who you are not married to – used to show strong disapproval —fornication /ˌfɔːnɪˈkeɪʃən $ ˌfɔːr-/ noun [uncountable]→ See Verb tableExamples from the Corpusfornicate• Many were almost illiterate and spent much of their time drinking and fornicating, as did some of the nuns.• Those who joined were forced to fornicate in the presence of others.Origin fornicate (1500-1600) Late Latin fornicare, from Latin fornix “brothel (= place for buying sex)”