2 minutes in episode 1, we see Fab Filippo's pubes and butt. Then we see his hairy butt crack and in briefly in between his legs what appears to be a sock on his dick.
3 minutes in episode 1, on one frame we see Randy Harrison's dick.
41 minutes in episode 1, we see Justin Tensen naked. We briefly see his balls and uncut dick, and then his nice butt. We also see Gale Harold's butt.

31 minutes in episode 1 of Season 2, we see Hal Sparks' butt.

16 minutes in episode 2, we see Gale Harold's butt.
23 minutes and 28 minutes in episode 2, we see Peter Paige and Hal Sparks' butts.

8 minutes in episode 3, we see Peter Paige naked.

14 minutes in episode 4, we see the butt of Jason Lambert.

31 minutes in episode 1, we see Robert Gant and then Hal Sparks' butts.

7 minutes in episode 2, we see Randy Harrison's butt.
8 and 15 minutes in episode 2, we see the bare butts and penises of some extras.

30 minutes in episode 3, some extras are undressed and we see their butts.
35 minutes in episode 3, we see Randy Harrison's butt.