Study: Vaginal Orgasm Significantly More Likely with 6"+NBP
I haven’t seen this posted before.
Women Who Prefer Longer Penises Are More Likely to Have Vaginal Orgasms (but Not Clitoral Orgasms): Implications for an Evolutionary Theory of Vaginal Orgasm
Journal of Sexual Medicine_2917 3079..3088
Rui Miguel Costa, PhD, Geoffrey F. Miller, PhD, and Stuart Brody, PhD
A 2012 survey study of primarily Scottish university-aged women shows women are significantly more likely to experience vaginal orgasm from a penis above 6" NBP length. It also proposes that the vaginal orgasm is a primary driver in the evolution of male genitalia size (which is the largest of any primate species). In my personal PE interpretation, this study suggests that among vaginally orgasmic women, 7 NBP or even 8 NBP length is ideal. Whereas among non-vaginally orgasmic women, below 6 NBP is ideal. Causation is not investigated despite the study’s title, so it’s not clear whether longer penises cause more vaginal orgasms, or whether vaginally orgasmic women prefer longer penises. Likely both.
Here is a link to the full study:
The study intended to build on the results of a similar Czech study, which I have not read.
Some excerpts in italics, my commentary in normal text.
The advertisement of the survey occurred primarily in Scottish universities…
The present sample consists of 323 coitally experienced women. Exclusion criteria were being coitally inexperienced and responses suggesting a high risk of misreporting…
The effect of penis size on the likelihood of having an orgasm from PVI was assessed by the question “All things being equal, are you more likely to have an orgasm from penis-in-vagina intercourse with a man who has a somewhat larger than average penis length? (Assume that average erect penis length is the length of a £20 note or any U.S. dollar bill).” Possible answers were a) more likely to have an orgasm with a longer penis, b) no difference—I orgasm equally well with long or average penis lengths, c) less likely to have an orgasm with a longer penis, d) I do not (or do not often) have an orgasm from intercourse, or e) I have not had enough penis-in-vagina intercourse partners to make a comparison.
The £20 note is 149 mm long and U.S. dollar bills are 155 mm long.
(5.9 inches and 6.1 inches respectively)
Note that the survey is asking the women to compare penis size to a 6 inch long bank note, with no mention of bone pressed or non-boned pressed measurement methods. In my PE bro science opinion, this would cause all the women to envision a 6" NBP penis, or approximately a 7" BP penis. The banknotes are presented as a representative of an average length penis, when in actuality, to these women, it is representing a penis that is about 1.2" above average length. Luckily for us, the study unwittingly has provided evidence for a female preference not only for above average length, but for way above average length. PE territory length. Exactly what we wish to know about.
Those with category d or e responses were excluded from further analyses related to size preference, leaving N=160 for such analyses.
So the study is now down to the 160 women who orgasm frequently enough, and have had enough PIV intercourse to compare penis sizes. Note that about half of the survey sample is excluded on this criteria. Mean age was 26 and SD was 7 years. So sadly, this survey indicates that about half of 20- and 30-something Scottish girls aren’t getting enough good sex.
Of the 160 women still qualified in the sample:
54 of them (33.8%) said they were "a) more likely to have an orgasm with a longer penis"
96 of them (60%) said there was "b) no difference—I orgasm equally well with long or average penis lengths"
10 of them (6.3%) said "c) less likely to have an orgasm with a longer penis"
Note that these survey questions have no mention of smaller than average penises and deal entirely with the likelihood of orgasm with an average or above average length penis. Also remember that because of the study’s methodology, the responses are informing women’s preferences regarding approximately a 7"BP+ size. In other words, 60% of women were indifferent between sizes 7 BP and above for PVI. And 34% of women were more likely to orgams from PVI with a length beyond 7 BP. Only 6% of women were less likely to orgasm with length beyond 7 BP.
Participants reported how many days they engaged in the following sexual behaviors and how many days they had orgasms from each of them in a recent representative month: PVI without additional simultaneous clitoral stimulation, PVI with additional simultaneous clitoral stimulation, clitorally focused masturbation (except vibrator), vaginally focused masturbation (except vibrator),masturbation with vibrator (alone or with a partner), clitorally focused manual stimulation by a partner, vaginally focused manual stimulation by a partner, receiving oral sex, and anal sex. Clitorally focused masturbation, vaginally focused masturbation, oral sex, and anal sex were differentiated as occurring with or without PVI in the same day.
As shown in Table 5, women who report that they are more likely to reach orgasm from PVI with a longer than average penis report having more vaginal orgasms within a previous month compared with women for whom penis size is not important for PVI orgasm. Notably, the groups do not differ in the frequencies of clitoral orgasm, orgasm induced by vaginal masturbation, or any other sexual behaviors.
Specifically, the 34% of women more likely to orgasm from PVI with a 7BP+ penis have an average of 8.76 PVI experiences per month, with 7.28 vaginal orgasms without clitoral stimulation. This is compared to 6.78 PVI/month with 4.68 vaginal orgasms without clitoral stimulation for the other 66% of women.
Note that the researchers chose to compare the 34% of women who prefer longer penis to the entire other 66%, rather than compare all three groups independently. I’m guessing that if they had separated out the group of women who were less likely to orgasm from a longer penis, they would find an even lower frequency of vaginal orgasms among that group.
To repeat the study, the groups had no significant difference in any other sexual behavior. In other words, according to this study, length matters only for PVI vaginal orgasm.
Perhaps somewhat ironically, they attribute this to cervical somatosensory nerve stimulation - the very thing the forums cite as a reason to avoid lengths exceeding 7 BP.
Because of the methodology of the study, there are some interesting PE related conclusions to be drawn.
6% of women would prefer less than 7BP.
60% of women are indifferent between 7BP and longer than 7BP. Again, this is a conclusion based on the methodology and the way the questions were asked. They compared 7BP to "longer than 7BP" and left anything to do with short completely out of the equation. That’s why I like this study so much. It speaks directly to the often discussed topic here of how much length is too much, choosing appropriately informed PE goals, when to go into maintenance, and the like.
34% of women prefer longer than 7 BP.
Now, this is very unscientific, but if I hold out a dollar bill in front of me, and envision a penis longer than it, I’m not envisioning a 6.5" object. I’m thinking of a 7" or 8" NBP. An penis significantly longer than the reference object. I imagine the women in the sample were as well. I don’t think it’s reaching to far to make the statement that 94% of women are at least indifferent to, or prefer a size 7 NBP or greater.
What the study can’t do, is speak to whether 34% of women prefer longer penises because they cause more vaginal orgasms, or if 34% of women prefer longer penises because they are more vaginally orgasmic women. My personal take on this, as a male who has explored various types of orgasm, and discovered new and different orgasms over the years - is that it’s very likely that a much higher percentage of women can become vaginally orgasmic from PVI, and that having access to a large tool is possibly a requirement for some of these women to make that transition. The physiology of nerve endings deep in the vagina and cervix is more similar than different.
Again, this is a statistical reach, but another interpretation is that among the women who are NOT indifferent between 7BP and longer - i.e. excluding the 60% of women who answered (b) on the questionnaire, and only including those who indicated a length preference for orgasm likelihood - that a whopping 5 times as many women preferred longer than 7 BP than those who preferred less than 7 BP. (33.8% vs 6.3%).
I have yet to read the Czech study, but at first glance it appears to indicate an even higher prevalence of preference for length in achieving vaginal orgasms, although I’m not sure if they made the same methodology mistake of comparing to a 6 NBP reference object. Their numbers were in the 65-75% range compared to the 34% of this Scottish study.
From a PE point of view, my takeaway from this study is that going for the 8 to 9 BP length range may create some compatibility issues with about 10% or less of women. However, reaching that length will significantly amplify the orgasmic experience of about 1/3 of women. And the other 55-60% of women don’t care either way. Adding in the ego and visually appealing motives for going for more length, this could be a green light to go for 8+ BP length for those who are on the fence about it and are willing to seek out vaginally orgasmic or length-indifferent women.
Before 5.5" x 4.1" ///////// Now 7.4" x 4.9"
