Sex Roulette (1978)

Lord de Chamoiz is an old sex addict and his niece, Veronique, is a roulette addict. Lord gets sexual favors from his female servants and his black dwarf servant, Balthasar, films sex orgies for his lordship's pleasure. On a trip to Monte Carlo Veronique is gradually enticed away from roulette to sex and finally demands that the roulette players gang bang her on the roulette table at a private game. Meanwhile Balthasar finds the (very large) girl of his dreams at the same party.