Un Bon client (1981)

Alban is a businessman, he wants to sign a contract with Eric, he also has other interests, he wants to fuck Eric's secretary, Katie and his wife Nicole. To do this, he came up with an insidious plan, inviting Eric and his wife to his house, summoned a girl of easy virtue, who should seduce Eric. What happened, Eric's wife saw this, which made her disgusted with her husband. She hid in the kitchen, overwhelmed with anger, then she saw Alban, after her husband finished with this call girl, he began to copulate with her. After that, Eric's wife joined this debauchery. Then, Eric's secretary, who was pleased with the signing of the contract, joined them.