Hey, I thought you said you didn't write risqué scenes . . . what was that little shower bit at the end, then?
One little thing, and I only mention this because I've struggled with similar issues, and because you seem receptive to comments . . . usually I like to keep my mouth shut because of living in a glass house and all, but anyhoo:
In little bits like those, you're giving the reader information overkill. We've figured out Darryl's problem after he speaks, so we assume Jason has, too (i.e. you don't need to say "now he understood"). And when Jason asks Pete to come in and piss, we get that he realized he had to pee.
I'm working on this myself; I think it becomes an issue particularly with 3rd person limited . . . maybe that's why so many people write in first :-)