https://www.imdb.com/title/tt0053604/

Director:

Billy Wilder

Cast:

Jack Lemmon ... C.C. Baxter

Shirley MacLaine ... Fran Kubelik

Fred MacMurray ... Jeff D. Sheldrake Ray Walston ... Joe Dobisch

Bud Baxter is a struggling clerk in a huge New York insurance company. He's discovered a quick way to climb the corporate ladder - by lending out his apartment to the executives as a place to take their mistresses. He often has to deal with the aftermath of their visits and one night he's left with a major problem to solve.