That question is what inspired my quest:
http://www.lpsg.org/142661-how-deep-is-your-pussy.html
I've been obsessed with the cds orgasm for ages and this poll brought home an important point for me... I am truly blessed. I'm not long by any means, but combined with her depth, we match perfectly. My wife's most intense orgasms comes from a blend of the deep spot and her clit being stimulated simultaneously. She can do this when she's grinding away on top of me.
Now, down to the numbers... I actually measured my wife's depth and she's 6.3" deep (based on the measuring method from my survey). I'm 6" nbpel, 7" bpel. Projecting those two numbers out, and assuming that I am stimulating her cds perfectly (footnote 1), I've come to the conclusion that you need 3/4" more penis length (bone pressed) than vaginal depth. This is due to two factors; glans squashing and amount of "give" from both vagina and penis at the bottom to press down hard.
Based on the survey results and making an already faulty assumption that those numbers are legit (they can't be, this is the internet), the average aroused depth comes in at 7.1" making the ideal penis length 7.85" bone pressed.
Asked and answered. Bet you weren't expecting a solid number, where 'ya?
- RawDog
Footnote 1: She's mentioned frequently how she can't rub that deep spot for extended periods because it gets sore. Proving that there are nerve endings that far inside her and that more length from me is probably unnecessary.
Interesting survey & posts, & quite a laudable pseudo scientific aim! Imagine actually being able to find "perfect fit" partners!
However, my on experience with about 100 women, & a cock flipping between 7.25, & just over 8 inches(none of that BPEL stuff!) - I simply cannot believe 44% of women can't take 7 inches. I NEVER couldn't get it in all but a couple of them (well not doggie style!) in at least one position.
I will admit that I have an insensitive dick(as well perhaps, as being one), that you could scratch, & even put clothes pegs on, without the slightest pain, & only a mild sting on the glans - & yes I've had the odd post-coital complaint. Then again I've only had 1 woman who wasn't swimming with juices - never needed any lube.
The point being, along with this & vibe play, I'd say 8inches is about where most women bottom out, & beyond this is painful.
I've posted myself that my current GF, though petit, is quite capacious. She orgasms when I take her lying on her belly saying I'm hitting all the right spots, & I can't even get the last 2inches in. However, last night - missionary style, it took 9.25inches of a vibe, AND about 6 inches of my cock @ the same time(couldn't get it all in) to make her scream. I don't know if it was the AFE or the 8.5inches girth, or both.
So I'd say the depth of the AFE varies with position.
I also have never noticed a woman's body adjusting to mine - NB GF above - it's been 8 months! (Not that I'm worried I quite like to stretch her - & she's very eager to be stretched more!)
In summary - a lot of what medical science says about the vagina is crap. It's based on statistically insignificant studies. I've not found one scientific study that determines that women' vaginas snap back - though of course on here, there is a lot of anecdotal evidence - but I've gotta say, I think most men wouldn't agree with that at all.
It would certainly help a lot of men & women's relationshipsif they actually did the research required to help couples achieve the best mutually satisfying sex possible.