It has long been politically correct to state that it's "not the size but the motion" that counts. Women have so long been under the thumb of religion and patriarchy and most women have learned that lying to "your man" is much more fruitful/profitable than denigrating him because of his lack of penis volume. And what good would bitching about penis size do anyway, it's not like a guy can change it. It is a done deal and it's simply not worth bitching about it once in a couple context.
However, that being said, that point of view in no way dictates that biologically speaking, the penis size is unimportant. The vagina is an elastic structure and responds differently to various shapes and volumes. In addition, most studies indicate that the the penis size to total body ratio is a fairly good indicator of female sexual selection in nature. And Homo sapiens males are very well endowed indeed in this regard, favoring a view that in Homo sapiens females do exercise choice (evolutionary speaking).
However, as in the another post on this forum regarding Homo sapiens brains getting smaller since agriculture, the fact that Homo sapiens have migrated to non tropical climes, began wearing clothes all the time and the advent of religion, female choice has been near totally emasculated. 20,000 years is long enough to create reproductive bias dimishing the value of a large penis. But this bias does not imply necessarily that the female vagina has had time to 'adapt' to lesser selection.
The following graph, in parallel with Adriana's comment on this board agrees that women's response to penis size is variable. It also demonstrates that "bigger" is not "better" in the absolute sense. But what it does support is that size is relevant. The important number to consider is that accross the board, beyond races and nationalities and age, the average male is between 5.5" and 6" in length erect. So when women are asked if they 'fake orgasm' and stats reveal that a whopping 50% of females have faked it and when we look at where that 'average' size fits on this graph, we can guess at the 'faking it' motivations. Our size range is simply incompatible. As for girth, I think we can simply say that if your fingers touch when holding the penis in your hand, it is on the narrow side. A mere little can of Redbull is 7" in circumference, and a regular soda can is close to 8".
Although I don't feel I know enough about this topic on a historic or evolutionary level, I have always had a scientific curiosity about this issue.
From personal experience, I don't think that the size of a man has a strong (I won't say any) correlation to penis size. One of my ex boyfriends is 5ft6" and I can confidently say he falls within the A category on the graph. He was also sexually adventurous (to a point), making for a highly enjoyable sexual partner. I have also been with much taller men who have not "measured up." Sexual repression versus sexual adventurousness has a lot to do with the level of sexual satisfaction achieved though, but I realise that isn't the issue here.
Ultimately, size for me is definitely something that matters, but it is not the only factor I look at. Ability, skill, generosity, and an experimental or explorative personality all play major roles in selecting the ideal sexual partner.
What T A A started the original post with really rang true for me. I have often felt actively disappointed that there is no way for a woman to know the size of a man's penis or sexual skill he possesses before she sleeps with him (excluding rare instances of hearsay). Physical intimacy is an important part of a relationship for me, but it's unrealistic and unsafe to jump from partner to partner just to find the ideal one. The societally accepted norm of dating someone for a prolonged time before sleeping with them is often detrimental to a relationship if the sex is sub-par, for both parties, hence my adage about no-sex-before-marriage: you have to test-drive the car before you buy it. But the alternative (of sleeping with each other virtually on sight) is not ideal either.
Although a man cannot determine a woman's skill in the bedroom simply from looking at her, he can still see basic physical characteristics like figure, breasts etc. I've never heard complaints about a woman's vagina being too small or too big, although I have heard about more grey-area issues, if you will, such as an elongated clitoris or extended/distended labia.
disappointed that there is no way for a woman to know the size of a man's penis [...]
I truly started considering penis size to be an aphrodisiac during the years I spent working in the Caribbean. The predominant dance style, in Trinidad for example, where the man stays behind the woman and is ONLY allowed to make hip contact (no smothering, no holding, no groping) is specifically designed for this purpose. The dance floor is a constant source of competition where women lead and men must follow each move, every gyration, every crazy rhythm... without pressing into the woman, simply keeping a delicate but constant contact, throughout the dance. And when the man loses control, he must walk away, unless they are already 'coupled'. It is quite normal to dance with 2 different guys in any given song. There are also stage versions of this fun little competition, and were not the men so dark we'd see them blush :) On stage, the point is to resist the erection, to prove that the man can withstand the rush.... it's a fun game :)
There have been innumerable quality studies demonstrating that a man's 'general size' has no relation to the size of the genitals. So that is not a consideration in this discussion. There is still debate however on the distinctions between flaccid/erect size. Most studies demonstrate that erect size is not proportional to flaccid size. And my experience concurs: I once had a boyfriend who was 3-4" flaccid, and zero inches in a cold lake. But his erection was double his flaccid size. However, if one started at 6" and were to double also, that would be scary!
One can only consider comparing the impact of genital size when we make sure to remove other variables, such as sexual repression, attraction, etc. It's an "all other variables factored out" discussion.
[...] I've never heard complaints about a woman's vagina being too small or too big [...]
I've definitely heard the "too big" complaint, especially for women after birth. It is even becoming a popular cosmetic surgery where women have their vagina 'refurbished', in addition to labial 'refurbishing', and hymen manufacturing, and anal bleaching (boy what porn makes normal women do!). On the other hand, a tight fight is generally considered aphrodisiac, so no it would not generally be the source of complaints.
[...] the distinctions between flaccid/erect size.
I don't know if these are universal terms, but we call them "growers" and "showers." If you are a grower then that means you are considerably smaller flacid than when you are erect, and that your flaccid state is not a direct indication of your erect state. If you "show" then that means your flaccid and erect sizes are more similar.
I forgot about the "too big" complaint for women after birth. I've heard that as well, it's just that as a 23 year old I'm not surrounded by any close friends with children or wives yet. The idea of a big vagina that requires vaginal rejuvenation surgery is one of the many things that turns me off the idea of child birth. I see it as a very unglamorous and unnecessary (as of recent times) process.
That Trinidad dancing you mentioned is fascinating. Close dancing is popular in clubs here as well, but that certainly sounds a lot closer than what I would be used to. Also, if the purpose or intention of the dance is similar to the Trinidad dancing then it certainly has never been mentioned, although I do like the idea. I find men who can close-dance decently in a club a turn-on, although based on my ex-boyfriend, whom I mentioned, it is a myth that dancing skill is an indication of sexual skill, since his dancing was mediocre at best. I only point that out because I used to be a firm advocate of that theory, being a lover of club dancing myself.
[...] considering penis size to be an aphrodisiac [...]
I never really thought about it from an aesthetic point of view before, but now that I think about it I would definitely say that simply seeing a larger penis elicits more of a sexual reaction from me than seeing a smaller one, which nearly elicits a feeling of pity or disappointment and certainly isn't an aphrodisiac in any way (speaking purely from an isolated topic point of view without the other factors such as skill, attraction etc involved). This is not to say that having a bigger penis automatically means you'll be a good in bed, or that men with smaller penises can't be sexually attractive, although my reaction to penis size certainly implies some ingrained biases in this regard. Either that or it is generally accepted that on a purely physical level penis size is directly proportional to level of sexual enjoyment.
Oh how I wish dancing skills were directly transferable to sexual skills :(
I have been known to be led astray by great dancers...
Sexual selection via dancing? This has got to be the best species ever!
Tho my own personal experience, which is vaster than this single study, hints that dancing ability among caucasians is not a reliable indicator of great sex, this could be an artefact from our society discouraging men from dancing for pleasure. Dancing in the Caribbean takes on a whole new meaning. Dancing ability can also be correlated to fitness... Erections are highly dependant on circulatory health (recent studies of ED). In this regard, general fitness can be a reasonable indicator of erectile function.
Does it offer a way of determining which ones you or your partner are?
How does it classify them?
Is there any explanation for people who fall out of the three classifications per gender?
Does it say anything about same-sex couples or multi-sex (LGBTI) couples?
Just curious, I find this fascinating.
Does it offer a way of determining which ones you or your partner are?
Just kick them in the groin area and listen. Neigh? Horse. Trumpet? Elephant. Etc.