In this movie, we get to see Zach Cregger's naked from behind. First of all, we see him at a hospital on a bed, and we can admire his hairy legs. Then he escapes from the hospital and his gown gets blown. At that point, we can see his young butt and as he moves, we can guess his balls flopping in between his legs. His butt appears to be hairless, maybe shaved as his legs are very hairy.