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Women with long index fingers on their left hands are more likely to have affairs, a study has shown.

The findings have surprised scientists as having a longer index finger is associated with having more typical female characteristics.

The longer index finger and shorter ring finger have been linked to being exposed to higher levels of female sex hormones in the womb.

It was assumed that women who were 'more feminised' would be more likely to be satisfied with their romantic relationships, and to be less impulsive.