TL:DR to prevent disease

Scientists have long been puzzling over the all important question: why do men exist? But now they think they've found the answer.

The confusion was why sexual selection - whereby men compete and women choose their partner for reproduction - actually occurs. In some species, the only male contribution to reproduction is their spermatozoa (sperm cell).

But researchers from the University of East Anglia, publishing their findings in Nature, believe selection helps to maintain health in the population and protects against extinction.

Almost all multicellular species on earth reproduce using sex, but its existence isn't easy to explain because sex carries big burdens, the most obvious of which is that only half of your offspring - daughters - will actually produce offspring. Why should any species waste all that effort on sons?

  • Professor Matt Gage, UEA
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