Lonely days for ugly boyfriends Note to guys: If your wife or girlfriend gets snippy with you for a few days every month, it may not be what you think. Instead, it may be time for an extreme makeover...for you. Researchers at UCLA studied over a hundred women who were romantically involved but not using hormonal contraceptives. On high-fertility days, the women felt less close to, and found more fault with, their partner if he was less attractive. This seemed to represent a biological impulse to seek fertilization services elsewhere. The good news is that the women didn’t report any change in commitment to their relationships.

Larson, C. et al., “Changes in Women’s Feelings about Their Romantic Relationships across the Ovulatory Cycle,” Hormones and Behavior­(forthcoming).