Die amourösen Abenteuer des Mr. O(1978)

Mr O picks up a busty brunette, XNK0731, and takes her back to his apartment. His wife, Jeanette, XNK0732, catches them at it, but joins in. Next Mr O. is nearly caught by his wife screwing his secretary, Bibi (XNK0507 as a brunette). She demands sex from her hsuband and the secretary listens at the door, before the wife drags her in to join them.