Rinbu (1988)

Inspired by Arthur Schnitzler's novel, "La Ronde", many people are having sex in a variety of ways. A girl and her boyfriend go to a pool bar where she is served a free cocktail drink courtesy of a man who wants to date her. Another guy challenges her boyfriend to a game with the girlfriend being the prize. Three men are fighting over the young woman and a winner takes the girl. It ends up as four guys and the woman in a hotel room.