The entire film is about the discovery of sex among a group of young teens
A girl is seen dressing, but no extreme nudity is shown.
Two boys discuss having sexual dreams, including one boy's dreams about his mother. In the same scene, one boy is asked if he's ever seen a naked girl.
One boy is seen lusting over his busty piano teacher, and she is seen taking off her blouse to expose her bra.
A boy is scene looking at an erotic picture, and masturbating.
A boy writes an essay explicitly talking about sex, and it is refered to several times throughout the film. He outwardly uses the words penis and vagina.
Two girls talk about how they have been sexually abused by their parents.
A girl lifts up her skirt in front of a boy.
A boy and a girl go into a hayloft and have sex. The boy's butt and the girl's breasts are briefly shone. They are later shown putting their clothes back on.
A girl wears only a long, white shirt, its implied that the shirt came from a man she had sex with. There are several implication in the same scene of this girl having sex with several men much older that she is.
Two young boys kiss each other.