I never paid attention to the physique of the guy, I've always found it hard to judge people's sizes and attributes just from pr0n anyway. Some female pornstars I thought to be giant amazones turned out to be midgets in real life too, when I saw them on some regular tv show standing next to the interviewer.
Overall my attitude to male pornstars is one of 'you yammy bastard, you actually get paid for this don't you?'. Resenting the guy takes away too much pleasure of watching the girl, so the only pr0n I consider looking at now is lesbian pr0n