To assess the link between women's waist size and her perceived sexual attractiveness to her partner - and their general sexual satisfaction - they rated a man's sexual function using a questionnaire called the International Index of Erectile Function.
Men who suffered the least performance issues were younger, had younger partners and their partner had a slimmer waist. Lead researcher Stuart Brody, professor of psychology at the University of West Scotland, said it was 'noteworthy' that a woman with a slim waist was regarded as more attractive in all measures of sexual function independent of both partners' age.
He said there were two main possible reasons for the 'waist effect'.
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Scottish researchers have found that the slimmer a woman's waist, the more satisfied her partner and the less likely he is to suffer from erectile dysfunction.
They say previous research has indicated that men generally rate slimmer women as more sexually attractive.