so I'm posting it here and there. If you've seen it elsewhere, please disregard. 
The Greatest Question That Can Never Be Answered But Will Be Eternally Pondered By Every Man With an IQ Above 60 Until They Stop Letting Us Fuck...
Why can the q never be answered? The same reason that large scale studies have been conducted multiple times with multiple scientific methods. Sex is subjective. We are ALL different. We're sexual snowflakes and therefore there are no givens. There are "highly likelies", "mostly trues", "oftens", and "rarelys", of course, but there are no absolutes, other than the parts we can hope very much that we've come standard with. I had a guy the other day, sadly, that apparently had never seen a diagram of the female sexual organ. You'd think we would ALL know that the clit is on top of the rest and in the center, roughly, right? LMAO. Sorry, but it's really funny that he was 2 inches from it and on all sides of it alternatively. You would think he would know that it doesn't move around, right? Sorry, but I really was highly amused! Did he know I was highly amused? No. However, I also didn't "fake" an O. Hell, I wouldn't reward that performance with even a fake out of courtesy. LOL. Do I fake Os? Yes, but rarely. The only reason I would fake an O would be if it was someone that I could logically conclude had never had sex or very, very rarely got sex. Why do I need to help teach a man like that with honesty when what I should give him, what I have an obligation to give him, is pretty much the biggest treat he can imagine? Why wouldn't I want him to feel like King for a Day, since he may go a year, 5 yrs, whatever, before an experience that I enjoy regularly occurs for him again? Follow me? Sorry, total tangent there. Back to schlong size and relativity to pleasure IN MY OPINION, which is at least very well tested, if conclusively true only for myself:
*drum roll*.......................
(Sorry, I'm a ham)
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Size is NOT the magic bullet that ricochets and knocks one woman dead from two angles simultaneously from the same gun. Sorry, Sushilover, if you're here. J/k he was a fun date and uses his rightly legendary tool well. However, that's because he truly likes women and bothered to learn, just like a less endowed man would do if he wanted to please his partner. In fact, truthfully, the overly (or well depending on your particular position) hung man has a much harder time in the sack, because many women "can't take it". I doubt a man has ever been turned away from a provider b/c of being too small, altho I did have an isolated experience that was interesting, leading me to term the phrase "turtle dick". I'll leave you to wonder about that. I still enjoyed that man, but I'll be honest again, thankfully it was only a French lesson (per his request). I enjoy giving pleasure. Bottom line. But yet again I digress. I'm gonna stop rambling and sum it up quick and dirty (which btw, is my ultimate sexual preference. )
Factors that most greatly affect female pleasure (obviously in a highly likeliy, since nothing is absolute)
#1: Not being afraid to pound her pussy like it's your last 3 minutes on the planet. I think the whole reason that the long sex thing I talked about earlier in this thread came to be a common misconception is because men found that they had to keep "banging" away on a woman forever because it's harder to cum for us if you're not hitting it fast and hard AND in the right spot. Tall order right? Not really. All ya gotta do is read her cues. If u move and she suddenly makes a new, more primal noise, or she starts grinding back, or if her eyes roll back in her head, or if she says,"YES, right there", then fucking FUCK THAT SHIT. Sorry, lol. Anyway. If she's not a highly verbal or reactive woman, my suggestion is to ask her what her favorite position is. Chances are, it is her favorite b/c she cums best in it. The unfortunate thing again is the lack of absolutes which brings me to part 2 of my answer.
#2: The way that the two of you fit together. I've gotten to a point where I can look at a cock and know if it's the shape/size/angle that's likely to rock my world the hardest. Even if it is tho, pt 3 of this answer and pt 1 of this answer must be addressed, or it's not gonna be the best it could be. I suppose it's easier for a woman to learn the sort of shape/size/angle that's her personal ideal, whereas sadly (or not since males are naturally more explorer-minded) you guys don't know what it's gonna feel like til ya stick it in there, unless it's hanging open, in which case I guess u'd have a good indication. LOL! And, even if I can "size up" a cock in about a second once it's hard, sometimes I am still surprised by the way one fits/feels once it's in there. Meaning, if it's not my "ideal", it can still be right up there with the best. Goddamn I don't know why I tackled this q it's so long and involved lol.