Okay, a woman needs to chime in here.
I can't believe you guys are leaving the penis out of the equation...lol. I personally am bowled over by the big ones. They are just so damned aesthetically pleasing that I get very turned on. Some men with big ones still end up being duds in the bedroom, though...lol. A girlfriend of mine and I came up with an idea of passing a law that all men must post a picture of their penises on their shoulder, like a nametag, because there is nothing worse than getting a great looking guy in bed and then finding out that he is hung like a shrimp.
Really, I'm being tongue in cheek here. There are lots of qualities that are more important, such as kindness, intelligence, etc. For pure aesthetics, though. That is what I like.