10 minutes in the movie, Sergio Fascetti and Franco Merli are forced to undress. We see their nice uncut penises and untrimmed pubes.
31 minutes in the movie, Aldo Valletti is showing his butt. He ends up being butt fucked.

5 minutes in the movie, we see Franco Merli naked.
17 minutes in the movie, an uncredited black man is also naked. He is hung like a donkey. We can see his erect dick from behind in between his legs.
He is cut.
60 minutes in the movie, we see Ninetto Davoli's butt, and then his uncut dick.
Again we see both his butt and cock 63 minutes in the movie.