Women with high levels of a key sex hormone are judged more attractive by themselves and others, and may be more inclined to cheat on their partners, according to a study published Wednesday.
University of Texas psychologists Kristina Durante and Norman Li found that women with high concentrations of the hormone oestradiol were likelier to flirt, kiss and have a serious affair outside an established relationship.
In a study published in the British journal Biology Letters, the duo described the behaviour as "opportunistic serial monogamy" and not related to one-night stands.
Instead, they suggested, such women were more probably being prompted to trade up in their relationships -- to find a better partner.
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High concentrations of oestradiol are associated with big breasts, facial attractiveness and low waist-to-hip ratio, with the result that men solicit such women.
The article goes on to explain the science of a hot woman having a long-term relationship with a wealthy man to make sure her material needs are met, but seeking flings with hotter guys to make sure her sexual needs are met.