Francis Leroi – Je suis à prendre AKA I’m Yours to Take (1978)
A classic piece of French erotica.
Bertrand wants his new bride, Hélène, to adopt his swinging lifestyle. He achieves this by leaving her frustrated while his servants spike her glasses of milk with aphrodisiacs while he goes off to attend orgies at another mansion. As a result Hélène has it away with the maid, the groom and the butler, sometimes watched by her husband, until finally he consummates their marriage himself and then takes her along to the orgy, in which she takes part enthusiastically.