Bob & Carol & Ted & Alice (1969) asks the swinging question, "What are friends for?" Well, the short answer is sex. This comedy of '60s hippies and free love follows one couple's sexual exploration with a bedroom invite to their best friends to join them in wife swapping. When the wives are as hot as Dyan Cannon and Natalie Wood it's easy to see why such an idea would pop into some guy's pants--uh, that is head. Speaking of head, the skin is pretty tame by today's standards. Dyan looks sexy, but only Natalie hints at giving up her goods with a moon that'll have you seeing stars.