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- April 2013 – More Frequent Vaginal Orgasm Is Associated with Experiencing Greater Excitement from Deep Vaginal Stimulation. Brody S, Klapilova K, Krejčová L. School of Social Sciences, University of the West of Scotland, Paisley, UK. (reference). Early life masturbation influences the vagina responsiveness to deep vaginal penetration. In other words, early life masturbation helps women’s vagina to enjoy deep penetration. On the other hand, a woman with no early life masturbation may not have her vagina responding to deep vaginal penetration.
- February 2013 – Penis size interacts with body shape and height to influence male attractiveness. Mautz BS, Wong BB, Peters RA, Jennions MD. Research School of Biology, Australian National University, Canberra, ACT 0200, Australia
(reference). Some women were shown computer generated pictures of naked men with different height, should-to-hip ratio & flaccid penis size. They were asked to rate them from 1 to 7. It appeared that both height & flaccid penis size have positive effects on male attractiveness. For instance, a model who was 1m85 with a 7cm flaccid penis got an average score by women. A model that was 1m70 required a flaccid penis that was 11cm long to get the same score.
- December 2012 – “Women who prefer longer penises are more likely to have vaginal orgasms (but not clitoral orgasms): implications for an evolutionary theory of vaginal orgasm.” Costa, Miller, Brody. ISPA, Unidade de Investigação em Eco-Etologia (Eco-Ethology Research Unit) ISPA, Lisbon, Portugal. (reference) After interviewing more than 300 portuguese women, they concluded that some women were more likely to get a vaginal orgasm with a penis that is longer than average.
- August 2010 – Vaginal orgasm is associated with vaginal (not clitoral) sex education, focusing mental attention on vaginal sensations, intercourse duration, and a preference for a longer penis. Brody S, Weiss P. School of Social Sciences, University of the West of Scotland, Paisley, UK. (reference). 1000 czech women participated to this study. First of all, They asked those female participants to report the consistency of their orgasm from penile vaginal intercourses from never to almost every time. For the ones who had orgasms, they were asked if they would more likely have an orgasm with a bigger than average penis. A greater-than-average erect penis size mattered to 34% of the interviewees.