The Cottage (2012)

Girl dances around in thong underwear. You can see her butt cheeks

It appears that two teens are having sex, as the male's bare back is visible and he is thrusting and making noises. It then becomes clear that he was "dry humping" and attempting to persuade the female into sex though she made it clear she was not ready. The male talked about how he made the girl "cum" (through oral sex [not shown]) and how next time he won't let her cum until they have sex first. No sex occurs, no genitals or breasts shown.