... to men they don't know. Matthew kindly sent me this link to a New Scientist story.

Research led by Nicolas Guéguen of South Brittany University had attractive men approach women with a polite compliment and a request for their phone numbers.  It shouldn't surprise us that women were much more willing to comply when their were fertile.

Women not on birth control pills were even more likely to hand out their phone numbers to strange men during their fertile cycle.

Ah, Mother Nature!