The sex is framed as something they shouldn’t be doing, so the scenes lean hard on secrecy, guilt, and the thrill of getting caught while they’re sucking dick or fucking. You usually see “forbidden” pairings like relatives or authority dynamics, plus lots of sneaking around, hushed dirty talk, and reckless bareback creampies that make it feel even riskier. Everyone is depicted as an adult, even when the setup plays up power imbalance and social consequences.