Les Soirees d'un couple voyeur (Year 1979)

Good old French cinema with Bridget Lae. So old (and available on the tracker in several versions) that there is nothing special to retell. And in a nutshell, the married couple Ariana and Victor are amused by the fact that, according to the announcement, they find new partners for their comfort, and when one partner is comforted, the second spies on him, thereby embellishing the everyday routine.