Some women who have affairs really can blame it on their hormones, according to scientists.
Those with high levels of the sex hormone oestrogen are less satisfied with their partners and therefore more likely to cheat, a study shows.
Such women are also likely to be physically attractive - and the researchers found that beautiful women are more likely to play on their desirability to snare the best mates. Dr Kristina Durante said: 'Physically attractive women may not only have more alternatives but also high standards that are difficult to satisfy.
'Accordingly, they have fewer reasons to be committed to any particular partner if higher quality potential mates are available.'
Dr Durante, of the University of Texas in the U.S., measured levels of oestradiol - a form of the sex hormone oestrogen - in 52 female students.The women were also asked how attractive they found themselves to be and some university staff were also asked to rate their appeal.
This showed that the students deemed the most attractive had the highest levels of oestradiol.
Those in relationships were also asked how satisfied they were and how likely they were to cheat.The analysis showed that the most beautiful women felt the least satisfied with their lot.
However, they would choose a long-term affair over a string of one-night stands, the Royal Society journal Biology Letters reports.
The researchers said: 'Without necessarily being consciously aware of their motives, highly attractive women are probably able to capitalise on their desirability and continually acquire valuable resources and a higher quality long-term mate by trading-up when the opportunity arises.'
Those with high levels of the sex hormone oestrogen are less satisfied with their partners and therefore more likely to cheat, a study shows.
Such women are also likely to be physically attractive - and the researchers found that beautiful women are more likely to play on their desirability to snare the best mates. Dr Kristina Durante said: 'Physically attractive women may not only have more alternatives but also high standards that are difficult to satisfy.
'Accordingly, they have fewer reasons to be committed to any particular partner if higher quality potential mates are available.'
Dr Durante, of the University of Texas in the U.S., measured levels of oestradiol - a form of the sex hormone oestrogen - in 52 female students.The women were also asked how attractive they found themselves to be and some university staff were also asked to rate their appeal.
This showed that the students deemed the most attractive had the highest levels of oestradiol.
Those in relationships were also asked how satisfied they were and how likely they were to cheat.The analysis showed that the most beautiful women felt the least satisfied with their lot.
However, they would choose a long-term affair over a string of one-night stands, the Royal Society journal Biology Letters reports.
The researchers said: 'Without necessarily being consciously aware of their motives, highly attractive women are probably able to capitalise on their desirability and continually acquire valuable resources and a higher quality long-term mate by trading-up when the opportunity arises.'
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