The whole premise of this movie is two couples going to meet each other to swap wives.

Girl gives man oral sex while he is driving. Cannot see anything but her head bobbing up and down on his lap.

Couple goes out into field and strips naked and has sex. Girl's breast, butt, and pubic hair can be seen. Man's flaccid penis can be briefly seen. No actual penetration is shown.

Woman gives man oral sex on a bench, head covers up action.

Woman masturbates in pool/hot tub, then man joins her and they have sex. her breasts, butt, and pubic hair can be seen. No actual penetration is shown.

Woman and man sneak up on Uschi and while man holds her down, woman takes off her clothes and performs oral sex on Uschi. no actual oral sex action is shown as it is covered by woman's head. Uschi's breasts, pubic hair, and labia (briefly) can be seen. Woman then takes off her clothes, breasts, butt, and pubic hair can be seen as she is being sexual with Uschi.

Man takes off clothes and starts being sexual with Uschi and blonde woman. His butt and pubic hair can be seen. Both women's breasts, pubic hair, and butts can be seen. Man performs oral sex on Uschi covered up by his head. Uschi then performs oral sex on man, covered up by her head. Uschi sits down on man's pelvis and they have sex. His penis is clearly flaccid and no penetration is performed or shown.

Husband arrives and blonde woman takes him into the house while Uschi and the other man stay by the pool. Blonde woman begins to take off husband's clothes inside while Uschi continues riding outside. Husband strips and has sex with blonde woman, his butt can be seen and her breasts, butt, pubic hair, and brief view of her labia can be seen. Uschi and other man come inside and join the first couple for sex. No penetration shown.