I'd suspect on average, that yeah, guys with smaller cocks are much more likely to be submissive with men. Just the way it goes I suspect, though not always the case I guess. Never been in a gay relationship either, so I'm sure it varies depending on who's with who, etc.
Being a fully bi guy, I've played both roles. Dom and sub. Having a smaller penis myself, I much prefer the role of sub. Not sure if that would be the case if I had an 8 incher, but maybe it would. I don't see myself being any less enthusiastic about sucking cock or wanting to get fucked in the ass, so...
Maybe physical size etc matters too. At 5'8'' and 195lbs or so, I'd feel kinda weird being anything BUT sub with a man that was 6'3'' 250lbs and with an 8 inch cock.
My personal rule when playing with men, is if he's got a bigger cock, I submit. So needless to say, that's almost always the case...which is more than fine by me!
