I think most men are hung up on the size of their dicks. Look how hung up you are, Mr. Cumalot, and you have enviable stats. Now take your insecurities, as someone who's penis is damn' near 7 and a half inches, and try to imagine for real the insecurities of a man who's packing only 5 inches, or 4 inches. A very significant portion of these men DO NOT APPROACH ANYONE for sex. Ever. I'm not going to insist that it's most of them. But I do insist that the number is significant. For example, there is a large message board, (though not as large as this one) with a chatroom and everything where men of small and average penis size get together to support each other. It's not as active as this website, because nearly all of the members are too ashamed to say anything out loud. The smallest ones have their own sub-section where their posts are secret from anyone without access to that exclusive section. These men in many cases have gone decades without sex. Some of these men punish themselves quite harshly for simply having been born with a smaller penis than they'd have liked.
Now, I had some incredibly memorable sex with a guy who had 4.5" of penis for me. He was very confident, pursued me aggressively, got past my walls (I don't like to be picked up) and fucked the hell out of me the day he met me! (And for a year after.) Also very sexy was the confidence of a man with whom I almost had sex who had a 2.5 inch penis. So I know there are men out there who are not hung big who can get women. Heck, my man's penis is average. But while I won't insist that the insecure ones are the majority, I do believe they are.
Go here. And finally put all these questions to rest.