Ménage (1986)

Bickering couple Monique and Antoine are interrupted by bisexual burglar Bob while fighting in a bar. With husband and wife in need of cash, Bob teaches them the most efficient house burglary methods. Monique is attracted to the charismatic thief, but Bob is more interested in Antoine, who eventually succumbs to his attentions. As the trio continues living together, Monique grows unhappy about being ignored by both men.