With regard to the couple mentioned above, both butts are seen. The actress is Lidia Vitale who lays bottomless with a bra on. Her vulva is not visible as it is covered by her trimmed pubic hair. Though naked, the man's penis is not seen.
Lidia Vitale's hairy vagina is clearly visible as she lays in bed bottomless (with no panties on) wearing just a black bra. Lidia's thick dark pubic hair is visible for a just a couple of seconds as is her bottom as she turns on her side in the same scene.
A couple is shown climaxing in fornication and then moments after the act. The man is nude and his bare buttocks are shown. The woman is shown bottomless with just a bra on and her bare buttocks and pubic hair(no genitals) are briefly shown.
Another couple engages in passionate kissing.
In her apartment as they embrace, a woman places man's hand on her breast. In one motion, he pulls down his pants and thrusts into her as she stands against a wall. Still connected, he carefully lays her on the floor and they continue. Nudity includes only male buttocks and bare chest.
Verbal references are made to an adulterous relationship.