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S ome primates, such as baboons and bonobos, have visual signals of fertility: their bottoms swell up and become infused with colour. Other animals are less attention-seeking, relying on pheromones emitted from their skin or in urine. The majority of female animals are only receptive to mating when in their fertile period or oestrus.
Any non-fertile sex is a waste of their time and any male trying his luck during this period will be refused. How intriguing, then, that human beings have evolved to do the opposite. Technically, human women can be receptive to sex 24 hours a day, days of the year. Subscription Notification. We have noticed that there is an issue with your subscription billing details. Please update your billing details here. Please update your billing information.
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Sara Pascoe. Sunday August 18 , Want to read more? Subscribe now and get unlimited digital access on web and our smartphone and tablet apps, free for your first month. Start your free trial.