Chastity - An activity wherein one or more individuals is prevented from experincing genital stimulation, sometimes with the involvement of physical barriers.
Condom - A thin pouch that covers the penis during sexual activity to prevent the transmission of sexual disease and pregnancy.
Creampie - Term describing the act of a penis ejaculating into a vagina or anus. The term is named for the act (and resulting appearance) resembling that of the process of filling pasteries.
Cuck/Cuckold - A man with a sexually unfaithful wife/girlfriend. Often used to describe men who gain sexual pleasure from the humiliation of having their wives/girlfriends have sexual intercourse with other men as they watch.
Cumshot - Term describing the visual of a penis ejaculating freely (aka not within something).