Barefoot in the Park (1967)

In this film based on a Neil Simon play, newlyweds Corie (Jane Fonda), a free spirit, and Paul Bratter (Robert Redford), an uptight lawyer, share a sixth-floor apartment in Greenwich Village. Soon after their marriage, Corie tries to find a companion for mother, Ethel (Mildred Natwick), who is now alone, and sets up Ethel with neighbor Victor (Charles Boyer). Inappropriate behavior on a double date causes conflict, and the young couple considers divorce.