Garrett Hedlund is shirtless a lot in the movie.
30 minutes in the movie, Garrett Hedlund is naked and we see his butt as he is carrying a friend of his onto a bed.
For a frame or two we can see his penis. Garrett Hedlund seems to have a medium sized dick.

28 minutes in the movie, JJ Feild is stripped naked. We see his big cut dick and his massive balls bouncing around. We get a long view at his frontal while they hold him and even apply honey to his pubes! Then he he attached to a pole, and while a man comes deliver him, we get another long view at his frontal, and can admire his low hanging big balls. We even get close-up view at his genitals. In the second part of the movie, JJ Feild is playing naked with a girl. As she squeezes fruits over his body, we see his big dick again. This time he is showing us a nice chubby. JJ Feild is naked a lot in this movie. There are also a couple of other guys showing frontals, but not nearly as much as JJ.

In episode 8 of season 1, we get to see a lot of nudity. There is the much expected rear nudity of blonde cutie Jai Courtney. We see his butt as he is making love to a woman. We hope we will get to see front nudity from him someday. Episode 8 is also an episode where threee new slaves are brought in: Mike Edward, Daniel Feuerriegel and Ande Cunningham. We see rear nudity from the three of them as they need to be presented naked. They all three have nice butts. In addition to that, there is the much commented front nudity of Mike Edward. During that scene in the area where we see all three butts, we get to see Mike Edwards huge uncut dick. It's obviously a prosthetic. On the Blu-ray version of the show, there is an extra scene with front nudity of Mike Edward.

Niels Schneider appears naked in episode 1 and episode 6 of this tv show.
In episode 1, we can only see Niels Schneider's butt. He has an amazing butt and also a very nice bubble butt.
Finally in episode 6, Niels Schneider is playing in the sea with another guy. As he moves around, we can see his dick briefly under water.

Hendrik Scheider is taking a shower 19 minutes in the movie. We get a very quick view at his uncut dick.
28 minutes in the movie, Hendrik Scheider kisses Aldri Anunciação. After the kiss, Aldri Anunciação shows a nice bulge in his underwear.
61 minutes in the movie, Hendrik Scheider is fully naked on a pier. We get a good view at the time at his naked body and smooth uncut penis.

In episode 5 of season 3, we get nudity from Will Tudor, Nikolaj Coster-Waldau and Kit Harington.
Will Tudor is naked in bed 51 minutes in the movie. As the steps out of the bed, we see his nice uncut penis. The picture is a bit dark. Then Will Tudor gets back in bed with his lover, and we see his bubble butt and somewhat hairy crack.

30 minutes through the movie, we see Sergio Peris-Mencheta wearing nothing but his undies. He reaches in and starts masturbating. Although we don't see his penis at that time, we see his pubic hair. Half way through the movie, Sergio Peris-Mencheta is taking a shower and we see him leaving it, first revealing his butt and then his thick uncut dick! A quick but very nice view! Later in the movie, we see Miki Manojlovic getting out of bed, showing a full frontal of his uncut dick and then his butt. It's a very long scene where we get to see both sides of him repeatedly.

There is a hippie scene at the beach where Jean Dujardin is naked resting on his belly, while a guy is caressing his butt. We get a good view of Jean Dujardin's butt during that scene. Later in the movie, Jean Dujardin ends up lost with Alex Lutz. Alex Lutz wants to bath, gets naked and goes into a lake. As he does, we get a good view at his butt. He spreads his legs apart, but we cannot see Alex balls or dick.