While I accept that guys won't talk openly about the attractiveness of other guys, do they at least think it? I find it hard to believe that they can look at a someone like Brad Pitt and think absolutely nothing about his physical beauty. I mean, good looking people are good looking people right? So how can a guy look at another guy and not even do a little bit of evaluating?
Not at all. Personally I can't even tell beyond the "I think he's famous for some reason or another".

Of course I'm utterly oblivious to Hollywood so that might be part of it.