i was wondering the same?? maybe they think this is my bedroom (it's just a room with my desk and computer) and there should be posters or something?? (I don't have anything on my bedroom walls either).
My guess is this:
One of the girls says something like,"Look on his wall and if there are posters of Kamali,Phil Heath and/or Frank Roberson,Kai Greene,Rodney St. Cloud than he is gay".
Then the other says,"There is nothing on the wall,he`s just sitting at his computer".
That was the part you missed.