Around a backyard swimming pool, two women are seen in bikinis and swimsuits. No male or female nudity.
After discussion of couple swapping with friends, during their drive home, husband runs his hand up the inside of his wife's thigh and she smiles. When they reach home, they begin kissing and removing clothes. As they kiss, he picks her up and presses her against a post as her legs are wrapped around his waist. They remove their pants and he carries her and lays her on their bed. We see her bra hit the floor, and sex is implied. Nudity limited to woman and man in underwear.
Two married couples agree to couple swap. In a living room, each trades spouses and they begin kissing passionately. One couple ends up laying on the couch. One man lifts the woman onto a table. Sex is implied. No nudity.
Two couples go to a sex club together. Women's cleavage is seen. They go to a private room and swap spouses again. They stripped down to underwear and have sex. No nudity
Husband goes alone to the sex club. A strange woman approaches and they kiss. As she goes to unbuckle his pants, he changes his mind and quickly leaves.
Husband sits talking to his wife in a bubble bath. He drops the towel wrapped around his but no nudity is shown. He climbs in the tub beside his wife to have sex. No male or female nudity. Implied sex.