Querelle(1982)

French sailor Querelle arrives in Brest and starts frequenting a strange whorehouse. He discovers that his brother Robert is the lover of the lady owner, Lysiane. Here, you can play dice with Nono, Lysiane's husband: if you win, you are allowed to make love with Lysiane; if you lose, you have to make love with Nono... Querelle loses on purpose.