Grégoire Leprince-Ringuet has a love scene with Louis Garrel 74 minutes in the movie. It is a very sensual scene but without full nudity. However when they wake up in the morning in bed, we get a good view at Grégoire Leprince-Ringuet's ass and hairy crack.

17 minutes in episode 6, Pierre Perrier is laying down naked on a table. We can see his big uncut dick.
44 minutes in the same episode, we see Pierre Perrier's pubes and then his butt as he is walking naked and the camera is following him.
Then he dresses up, and we see his big dick in between his legs.