Researchers have discovered that females with multiple sexual partners can be more fertile than those that are monogamous, and this because of an “overproduction” of sons.  The study – still only published as a provisional article but already one of the most accessed in BCM Evolutionary Biology – helps to explain a puzzle haunting evolutionary biologist for decades: why so many females chase multiple sexual partners in a mating season, when this is costly and dangerous, and one is enough to fertilize all her eggs. The discovery that the behavior increases their fertility (and allows them to change the offspring gender) can now explain why. 
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