Size really doesn't matter because there's so much to every aspect of lovemaking that it becomes a drop in the ocean compared to everything else you have to get right in order to make the experience pleasant. There are lots of guys on here who think size is the be all end all of everything - it becomes a sort of competition to them, whereas the scant amount of (real) women on here alone should tell you that it ranks pretty damn low on the spectrum of desirable traits in a man.
Do you really think the hung men on here are getting PMs from hot and horny women all the time because of their size? They're not. The way to appeal to someone else is nearly always through their heart and/or mind, even if that person happens to be on a site like this.
To be honest, I think size is just one of those things like money, where everyone wants it, but if they have it, they're kind of like "oh well, ho hum." I read a post by a guy on here the other day who was stressing out about his height. It's the same sort of thing. But it doesn't matter, none of it does. Height, weight, looks, income, cock, none of it. All there is in life is love and chemistry.