The 1969 movie Bob & Carol & Ted & Alice explored themes of honesty and faithfulness in marriage. It even showed an attempt at wife-swapping between an open-minded couple and their more traditional friends.
When you see Natalie Wood, wearing a paisley bikini, involved in the story, things feel more intense. Wood played Carol, a character determined to be completely honest with her husband, Bob (played by Robert Culp).
Carol and Bob were open about their affairs outside the marriage. However, Ted (Elliott Gould) and Alice (Dyan Cannon) weren’t as comfortable with the idea. During a deep discussion, Alice surprises everyone by insisting they swap partners. It works for a moment, but then quickly falls apart.