"size doesn't matter" says the man with the extra large dick. It's like rich people saying, "money really isn't all that important". Look, I agree, guys focus way too much on it and probably assume it matters much more to women than it does...but seriously, the OP has a bunch of pictures of him proudly displaying his penis and comparing it to show it's size. What makes you think all guys don't want a big thing to be proud of, regardless of what women prefer?
Does it matter in the end? No, not really. It is a desirable feature amongst 95% of straight and gay men? Yes. Why? Who the fuck knows really.
Why can't we leave it at the facts:
1. A very select group of women prefer and even require a large penis.
2. A slightly larger group of women enjoy looking at large penises, but it doesn't have much effect on their physical needs.
3. Some women will admit to a thicker or longer penis feeling better, or "filling them up more" but it's not on the top of their list of requirements in a partner.
3. Most women don't care about the penis size of their partner as long as it's within the realms of normal or average.
4. ALMOST all men would like a big penis regardless of the above statements and no matter how many times women themselves downplay the importance of it.
5. Pictures of huge cocks on a big cock website will not help those insecure about their size, and certainly a thread started on such site by such a member will not either.
I think these comments sum things up pretty well. No doubt in my mind that men are generally much more hung up on penis size than are women. I think most women care at least somewhat about penis size in that they are looking for something that is "functional", i.e, not so small as to make penetrative sex impossible or impractical and not so large as to make sex impossible, painful, or require a major hour long foreplay "production" every time they just want to get laid.
As for kc2007, I'm quite sure I have given women more orgasms with my tongue, and/or fingers, than I have with my penis. Many women are not vaginally orgasmic although in my own experience about half the partners I have had have been capable of orgasms with vaginal intercourse without direct clitoral stimulation. Some could do it very regularly and others only now and then. But the percentage in my own experience has been higher than the 10-30% of women capable of vaginal orgasm statistic that is often mentioned on the internet.
I do believe that penis size ranks relatively low on most women's list of desirable attributes in a potential lover. Having said that, it has struck me that I have heard multiple women use almost exactly the same words to describe a sense of satisfaction with my particular size after having sex: something along the lines of "you fill me up so well". And I have had several female partners who were very regularly vaginally orgasmic who told me that they had an easier time achieving orgasm with me than with other smaller male partners. It is worth mentioning though that one of these women would have readily kicked me out of bed if her other regular (smaller) male sex partner had come calling, so clearly orgasms don't count for everything.
And I do not buy the notion of the "one size fits all vagina", i.e, a vagina that is smaller than nearly all erect penises "at rest" that magically expands just enough to accommodate virtually any penis when aroused. I haven't fucked hundreds of women but I have enough experience to know that there is considerable variation in vaginal anatomy. Some women are much snugger than others and I have had a fair number of partners in whom I never touched anything in their vaginal depths with a bit over 7" insertable length.
From the male perspective, I think larger size does offer a few advantages that haven't been mentioned. It opens up the possibility of exploring positions that might not be feasible for shorter guys. It also allows for taking longer strokes which I like, as do some gals. And it makes it much less likely that the rhythm will be broken by frequent "popping out". And I don't care if it is psychological or physiological, but for me the sensation of pressing up against the end of a woman's vaginal canal during sex just plain feels good.
On the downside, larger size can make some positions uncomfortable for the woman (doggy style seems to be the most common one) unless the man is mindful not to fully insert. If the guy is too long to go balls deep, it makes indirect clitoral stimulation through pelvic pressure impossible. I have also had several partners tell me how much they enjoyed the sensation of my balls slapping against their ass when banging face to face, or against their clit with rear entry positions. If a guy is too long, this isn't going to happen. And larger size can make oral sex difficult for women, let alone deep-throating, and it renders anal sex problematical or impossible. Larger size can also make quickies less likely.