About two thirds in, during one of the group get togethers, the six have paired up. Billie starts an argument with Wendy which blows up until Billie is confronting her more physically. During this, Billie stomping around the room, wearing only a T-shirt, and her pubic hair is clearly seen.
The whole film revolves around six friends who like to hook up and have sex.
There's only a few people that actually get topless.
A girl and a guy have sex, but most is implied and no nudity is shown.