Fertile women more open to male advances

A new research study suggests that women are more likely to give their phone number to a man they don't know when they are most fertile. Psychologist Nicolas Guéguen of the University of South Brittany and his colleagues report their results in the scientific journal Biological Psychology. From New Scientist:

Guéguen is cautious in his interpretations, but the study seems to offer real-world behavioural support for studies showing that women are most receptive to advances when they are likely to get pregnant.

Hormones could play a role, as estradiol (a form of oestrogen) and progesterone levels wax and wane during a woman's cycle, and most birth control pills contain progesterone. But Guéguen worries that a woman's relationship status will confound such associations, since single women could be less likely to be on birth control.

Fertile women more open to corny chat-up lines