CAC is an abbreviation that stands for "Cum-covered Ass." It refers to a sexual act or scene in which a female participant has semen, or cum, on her buttocks. This can be as a result of anal sex, a male participant ejaculating onto the woman's butt after vaginal or oral intercourse, or it can even be simulated for the purposes of adult entertainment content. CAC often highlights the natural and intimate aspects of sexuality and serves as a source of arousal for some viewers