Mystery Alaska (R, 1999)

Parents need to know that this movie has very strong and very vivid language, including locker-room style descriptions of sex, a child's use of four-letter words played for humor, a wounded man's use of very strong language played for humor, a character who has casual sex with almost every woman he meets (and who apologizes to the husband of one of them, with no suggestion that this might make the woman seem like property), explicit depictions of sexual encounters, including one between teens, and some violence (punched noses, semi-accidental shooting resulting in minor injury). The teen girl says that she wants to have sex because she's afraid of losing her boyfriend, which parents may want to discuss. The boy makes it clear that he's perfectly comfortable with waiting and doesn't want to do it for that reason. They then go ahead, but aren't able to complete the act, which causes great feelings of insecurity for both of them. Her mother, though clearly uncomfortable, responds with sympathy and support.