Patricio Ramos and Mario Verón are both naked for a good part of the movie. They are both hot.
18 and 21 minutes in the movie, we see primarily Patricio Ramos's butt.
34 minutes in the movie, there is a nice view of Mario Verón naked on a couch. We see his ball and a piece of his big dick in between his thighs.

45 minutes in the movie, Marco Bechis is pushed in a hallway, naked and handcuffed. We can see his uncut dick dangling around. In the next scene he is tied naked to a table and we can clearly see his uncut penis. 51 minutes in the movie, someone enters his torture cell and we can again see his penis from a different angle.