This is an oldie from 1999, but I’m clearing my many many links, and it’s an interesting piece of research. So it’s not only men who “naturally” stray in the cause for better genes:

BBC NEWS | Science/Nature | Women’s choice of men goes in cycles

Women are attracted to more masculine-looking men at the most fertile time of their menstrual cycle, psychologists have shown.

During the less fertile times, they choose men with more feminine-looking faces. These are seen as kinder and more co-operative, but less strong and healthy genetically.

A controversial implication of the new research is that, in evolutionary terms, it is natural for a woman to be unfaithful in order to secure both the best genes and the best carer for her children.

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