Researchers said for some external sign women's period

Redness of the cheeks, the woman may talk about the onset of menses. To the naked eye, such changes are difficult to observe, but scientific methods are registering certain differences in skin color upon the occurrence of ovulation, writes Live Science.

It is proven that men perceive a woman more attractive if she is at the stage of ovulation. At this time, the voice and scent of a woman becomes more attractive. Redness of the face could not see much, but the number of male volunteers celebrated blush in women during menstruation.

Similar mechanisms work in primates. Redness of the buttocks in monkeys is ready to mate and conceive offspring. The women in this attached behavior change. They become more playful, prone to flirting. Many assign to care for themselves during ovulation longer emphasize their strengths.

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