Jack+Jill (1979)

Jack and Jill decide to liven up their marriage by exploring the wild, kinky and surprising world of a couple who are married but not to each other. Originally, an American film by Chuck Vincent. Maîtresses très particulières is the French Alpha France package of that same film, released in 1980 under Burd Tranbaree — i.e. Claude Bernard-Aubert. He did not sit on set with Vincent. He took Vincent’s footage, dubbed it into French with new street-argot dialogue, and cut in his own Paris exteriors so the New York swingers would look like a bourgeois couple named Didier and Estelle.