Pre-historic sex

Neanderthal sex boosted immunity in modern humans

Sexual relations between ancient humans and their evolutionary cousins are critical for our modern immune systems, researchers report in Science journal.

Mating with Neanderthals and another ancient group called Denisovans introduced genes that help us cope with viruses to this day, they conclude.

http://www.bbc.co.uk/news/science-environment-14673047