The permissive mores of the late ’60s opened up new horizons for movie comedies, and this is one of the best. When a couple (Robert Culp and Natalie Wood) engage in separate indiscretions, they come to rationalize the acts as a part of the new morality. Later, they decide to involve another couple (Elliott Gould and Dyan Cannon) in a sexual foursome. This was a massive box office hit and a cultural touchstone. It was also the last lead role played by Natalie Wood for nearly ten years as she entered a period of semi-retirement to raise a family.