Missionary is often written off as the most boring sex position, but it might just be the best way for women to achieve orgasm.
Researchers at a private gynaecology clinic, New H Medical in New York, found that missionary with a pillow placed underneath the woman's pelvis is the most effective position.
Doctors used an ultrasound scanner on a straight couple to examine the position most successfully stimulating clitoral blood flow.
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The couple tested five positions for 10 minutes each, including face-to-face with the female above (cowgirl), face-to-face and seated (lotus), face-to-face with the male above, with and without a pillow (missionary) and kneeling with the woman bent over (doggy-style).
The pillow under the pelvis during missionary was key to getting to the big O as it allowed for deeper penetration.
Dr Kimberley Lovie, a research physician in New York who led the study, wrote: the purported benefits of various coital positions are described in numerous magazines, books, and public forums.
'However, there is little scientific research that evaluates the association between different coital positions and their ability to produce female orgasm.'
The study's objective was to "compare clitoral blood flow before and after coitus in each of the five positions, after a standardised period of time."
It revealed that face-to-face positions generally enhanced clitoral blood flow, leading to better orgasms and that 'doggy style' was the least effective.
"The kneeling/rear entry position produces the least amount of direct clitoral contact, and resulted in a negligible increase in blood flow compared to the face-to-face positions," wrote Dr Lovie.
The researchers behind the study hope that their findings will help people achieve satisfaction.
"Clinicians can use these findings to counsel patients about which coital positions might help them achieve climax," they wrote.
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