| Noun | 1. | sex act - 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 occurdefloration - the act of depriving a woman of her virginity (especially by rupturing the hymen through sexual intercourse) insemination - the introduction of semen into the genital tract of a female fuck, fucking, nookie, nooky, piece of ass, piece of tail, roll in the hay, screwing, shtup, ass, shag, screw - slang terms for sexual intercourse penetration - the act (by a man) of inserting his penis into the vagina of a woman | |