well i find it kinda uncomfortable when a guy has a really big dick. and its also really hard to give head if it is too big(the biggest guy ever been with was 8).so size does matter-but not that much.
The only advantage of having a larger cock is that it allows you to be a little more creative in the way that you bang. You can do positions that most shorter men cannot. This is a big plus.
a playboy article a few years back(yes i actually do read the articles) said he did one gay seen and they had the guy dressed like a girl because he could not get hard. thats just what i read though, who knows.
No I'm not gay, but I anytime I've ran a train on some chick with my boys, the Colombian guys would fucking intimidate me cuz their shit was hanging practically by their fucking knee caps!!!