Up the Establishment! (1969)

Married for four years to the charming Elena, Gustave feels the need to stimulate his sexual activity. His erotic obsession is fueled by various magazines whose advice he tries to put into practice. He responds to advertisements for parties where spouses are exchanged, and finally decides to organize his own orgy at home. But on the evening of the party, he is rushed to hospital for contact with epidemics. Worried about Elena, he escapes, finds the house upside down and kicks everyone out, unaware that Elena has fled the party to take refuge at the neighbor's with their baby.