Although there is a lot of casual nudity in this movie, considering the context of a group of young men staying in a big isolated house that includes a pool, sauna, and jacuzzi, one would expect to see much more.
The movie is set in the summer. The men are generally shown wearing only swim shorts or underpants. Bulges are clearly visible. Chests, arms, legs, and feet are shown throughout the movie. Shirts, long pants, and shoes are the exception.
A man, wearing only a t-shirt, sits on the edge of a kitchen counter. His penis and scrotum and fully visible. This is merely casual nudity; nothing sexual is implied. Someone suggests he put on some swim shorts. The comment is made that he often walks around naked.
A man removes his swim shorts and enters the swimming pool naked. His penis and scrotum are clearly visible before he enters the water. His butt is clearly visible while he's in the water.
Men are seen getting into bed naked, sleeping naked, and getting out of bed naked. Again, this is merely casual nudity and is not presented in a sexual manner.
A group of men are shown in a sauna. They are all naked. Penises and scrotums are clearly visible.
Someone removes a bedsheet off a man who is sleeping naked in an effort to wake him. He is sleeping on his back. His penis and scrotum are clearly visible. He does not wake up and the effort to awaken him is abandoned. However, the bedsheet is not returned.
A man masturbates with his hand inside his shorts. His hand, penis, and scrotum are all hidden by his shorts.
Men are seen wearing nothing but bath towels.
Men are seen entering and exiting showers while naked. Penises and scrotums are sometimes visible.
A man and woman have sex. The man is on top. The scene is shot with their feet towards the camera and their heads away from the camera. The woman is almost entirely covered by the man. Her knees and lower legs are seen while he thrusts between her legs. His entire backside is seen including his butt.