Some kissing scenes.
There is a scene in which two young children (maybe 12-14) climb into bed together fully naked, but they don't actually have sex and are caught by an adult.
There's a scene of wife swapping at a swinger's key party. Married man and married woman conduct an extramarital affair; they are seen orgasming in her son's bed.
A teenage girl gets so drunk, she falls on a teenage boy's crotch.
A boy and a girl slowly show each other's genitals. Not clearly seen but the reactions are shown. The boy freaks out afterwards.
Two children make out on the floor and are caught by her father.
Two sex scenes involve some nudity.
A couple make out in a car.
The film implies most of its content (unlike the book) rather than actually showing it.
Heavy sexual dialogue.