Fögi Is A Bastard (also known as F. est un salaud) is a 1998 French/Swiss film about a 15-year-old submissive boy named Beni who falls into an abusive relationship with a dominant 25-year-old punk rocker/druggie named Fögi.
The film is pretty startling in its depiction of a Dom/sub relations. Here are a few clips from the movie: