What if there were five days every month when your customers were unusually receptive to your product? If you market products or services that make women more attractive (apparel, cosmetics, diet programs, etc.), those magic days exist. New research shows that women’s purchasing behavior is unconsciously influenced by their hormones. Specifically, it was found that women who are ovulating buy and wear sexier clothes, and their choices are less influenced by men than by the need to outdo female competition.