You ever notice about Rawls?
The guy seems to use the phrase cock sucker in every conversation on the show even though he is gay. I imagine he does that to hide his sexuality. It is an interesting part of his character.
Then, when Landsman goes into the bathroom it says "Rawls sucks cock" on the wall. See the video below.
http://www.youtube.com/watch?v=BHPA4bxSTXs&t=3m0s