CIDE DICTIONARY
fornicate, a. [L. fornicatus, fr. fornix, -icis, an arch, vault.].
fornicate, v. i. [L. fornicatus, p. p. of fornicari to fornicate, fr. fornix, -icis, a vault, a brothel in an underground vault.].
THESAURUS
fornicate
ball, be intimate, be promiscuous, chase women, cohabit, come together, commit adultery, copulate, couple, cover, debauch, diddle, dissipate, frig, grovel, have sex, have sexual relations, lay, lie with, make it with, make love, make out, mate, mount, philander, rake, screw, serve, service, sleep around, sleep with, swing, wallow, wanton, whore, womanize
ROGET THESAURUS
fornicate
Sexuality
VB
mate, copulate, make love, have intercourse,
fornicate, have sex, do it, sleep together, fuck, sleep around, play the field, masturbate, jerk off, jack off, play with oneself, have the hots, become aroused, get hot, have an erection, get it up, come, climax, ejaculate.