Operation: Squeeze Toy 
Sex Dictionary: O
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OCT (optimum cum time): the male orgasms and ejaculates at just the precise time so that both he and his partner are fully satisfied at the same time
Onanism: An old derogatory term for masturbation that refers to Onan in the Bible who "spilled his seed." It is now believed that instead of masturbation, Onan withdrew from his partner during intercourse and God was angry at him for not procreating.
one night stand: A sexual affair between two or more people who will probably never see each other again
on the rag: derogatory term for a woman who is on her period
oral intercourse: A sexual activity whereby the mouth of one person is used in connection with the sexual organs of another person to produce sexual gratification
orgasm: The peak of sensation during sexual activity during which sexual tension is released