Typically full frontal male nudity including penis and scrotum but partial female topless nudity only
The most explicit scene occurs a few minutes into the movie. Therese Andersson quickly undresses and her breasts and thick pubic hair are visible. She then pulls down a guy's pants and his semi-erect penis and scrotum are immediately visible. Therese is then seen holding his penis with the hard tip being clearly visible for a while (the glans is fully exposed). Although she stops short of full oral, she does appear to lick the head of the erect penis momentarily.
Many teenagers skinny dip.