A survey of 160 Scottish women revealed that for those who highly value vaginal orgasm, a longer penis is preferred.

Over a third of the women (33.8%) claimed they were more likely to consistently have a vaginal orgasm when their partner’s penis was longer than average, however 60% of the women said size makes no difference.

Researchers believe the findings may be attributed to several variables.

One theory is that sensory nerve endings that could trigger orgasm run the entire length of the vagina and into the cervix and some women have a greater response to deeper penetration and stimulation of these areas.

The study did not show that possessing a larger penis had any bearing on the frequency of inducing other forms of female orgasm (including clitoral or orgasms achieved through oral sex).

It is suggested evolutionary factors could be partially responsible for women’s preference of a mate with a larger penis in terms of their perceived ability to perform and reproduce.

It is noted future studies would likely involve more precise measurements of penis size and might also evaluate if women have a preference for larger than average girth.