Pablo Echarri plays a straight guy and we get to see him naked (both frontal and rear). We see a butt a lot throughout the movie (and it's a nice butt!). And then finally, as he is having sex with his girlfriend, we get to see his uncut penis. There is extended footage of him naked. Eduardo Noriega and Leonardo Sbaraglia play a couple. We see them naked but not as much as we would have wanted. Leonardo is bisexual in the movie, and we see his butt when he is having sex with a woman.
Belén Fabra plays a nymphomaniac, so we see her having sex with guys all the time. Lots of nudity in this movie, especially a lot of rear nudity which cannot be all credited here! The main frontal nudity is from David Vert. After making love to Belen, he argues with her, and we get a good view at his uncut dick and ass. We can also note a good rear nudity from Leonardo Sbaraglia in the movie.