Esclave pour couples (1981)

Olga, a dominating, sadistic, haughty, and very jealous woman, also completely schizophrenic. She hires Patricia, a young virgin girl who must submit to her whims. With her husband, Paul they ostensibly indulge in the most torrid orgies and play perverse games. But she ends her life paralyzed as a result of a gunshot by accident.