Judith JorgeSEGUIRMadrid Updated: Save Send news by mail electrónicoTu name *

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females of many primates, such as baboons, exhibit an eye-catching swelling of the genitals that warns as a traffic light of their fertility. Is the signal that they are receptive sexually, coinciding with the stage of ovulation. Women, in contrast, have to resort to graphics, test strips or portable technology to know when they are fertile. The phenomenon is called ovulation hidden and what we share with very few mammals, such as Rhesus monkeys or dolphins

For nearly half a century, the lack of estrus in human females has been explained with the so-called hypothesis of investment male . By not having signals on the state of ovulation of a couple, the man is keeps your side, forging