Sexual activity refers to any type of behavior or physical contact that involves a person's sexual organs or functions. This can include various forms of foreplay, such as kissing, touching, and caressing, as well as penetrative sex acts like vaginal intercourse, anal sex, oral sex, and masturbation. It also includes non-penetrative activities such as mutual masturbation, frottage (rubbing against another person), and petting (kissing and touching without penetration). Sexual activity can occur between people of any gender identity or sexual orientation, and it is an essential part of human physical intimacy, bonding, and pleasure.