"Dr. Alverne and colleague Dr. Virpi Lumma reviewed and discussed new research supporting the conclusion that use of the pill by women disrupted their variation in mate preferences across their menstrual cycle. The authors also speculate that the use of oral contraceptives may influence a woman's ability to attract a mate by reducing attractiveness to men, thereby disrupting her ability to compete with normally cycling women for access to mate." The second link is the study, Link 1 Link 2 Not sure if these have been posted here, but I had to post them since they are a Redpill goldmine. Be sure to read the actual study, it's got lots of pretty tables and charts (table 1. and the images/data section)