The gang runs down a pier to go skinny dipping - we see breasts, bush, rears.
Anna and Erik have sex in their bed, we see both of their rears and her breasts. Later they are naked in bed, smoking and talking after sex, no privates seen.
Erik and Emma are naked after sex, no privates seen. Another time Freja finds them after sex, but they are partially clothed.
Freja has first sex with Peter, a teen boy. They do it again later, we see his rear.
In one scene we see from the far side of the room one of the men cleaning the room. His bathrobe is open, exposing his genitals from afar.