In this movie...

85 minutes in the movie, Jirí Cerný is naked taking a bath. We first see his butt, partially. Later in that scene, as he is fighing with other guys, we see his dick very clearly on a few frames. Jirí Cerný appears to be cut. 89 and 91 minutes in the movie, there are additional partial shots of Jirí Cerný's penis.