Women orgasm more quickly and more often with handsome partners, according to research carried out by anthropologists and psychologists.
Noting that "supporting evidence indicates that female orgasm promotes conception," the researchers concluded that the female orgasm is linked to the urge to produce "quality" offspring.
The study, which was carried out at Pennsylvania State University, focused on the sex lives of 110 heterosexual couples, who reported who orgasmed and how often.
The male subjects were rated for "objectively-measured facial masculinity, observer-rated facial masculinity, partner-rated masculinity, and partner-rated dominance"; observers, as well as the men themselves, were also asked to rated their own attractiveness.
Women whose partners rated as masculine and dominant reported more frequent and earlier-timed orgasms than those whose partners rated less well. The women whose partners were deemed attractive also orgasmed more often during or after male ejaculation.
Frequency of female orgasm as a result of masturbation was not predicted by the male partner's attractiveness.
"Thus, possible conception-promoting correlates of female orgasm may be especially effective and/or likely when copulation occurs with masculine males," the authors wrote in the study, published in the journal Evolution and Human Behaviour. "These results appear to support a role for female orgasm in sire choice."
Follow Life&Style on Twitter @Life_Style_News