Haselton, Bleske-Rechek and three UCLA students tracked 30 college coeds in committed relationships through an entire ovulatory cycle. Using urine tests that are nearly as accurate for determining ovulation as ultrasounds, they ascertained each woman's most fertile period -- about 10 to 15 days after menstruation -- and their least fertile period -- roughly the two weeks following ovulation. The researchers photographed the women twice: once in their fertile (follicular) phase and another time in their non-fertile (luteal) phase. To ensure that only the women's attire, grooming and accessories were taken into account, researchers masked participants' faces in the photographs with black ovals.
Researchers then arranged the photos in pairs on a kind of scientific version of the Web site "Hot or Not." Forty-two judges -- a little more than half of them women -- were asked, "In what photo is the person trying to look more attractive."


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