Ebert's Glossary

"Antiheroine Skin Rule: In a Horny Teen-ager Movie, the 'bad girl' who is the object of the hero's desire will always expose more flesh than the girl whom he ends up with at the end of the film, despite equal sexual activity. If the 'good girl' is shown topless in a love scene, it must be accompanied by slow music. In a Dead Teenager Movie, the girl who exposes the least skin is inevitably the only survivor."