It tongue comes down to our lingering evolutionary urge to sniff out a genetically compatible mate, although nowadays a person's genetics isn't the only thing that draws us to them otherwise Tinder and hook-ups wouldn't exist. Still, people love a good snog in almost every culture in the world, and those which don't get up close by sniffing or smelling instead, explains Dr Sarah Johns, an expert in human reproduction and evolutionary psychology at the University of Desi sex positions. That makes a couple more likely to produce a child better equipped to fight infectious disease, which was pretty important before modern medicine and the advent of vaccines and antibiotics.
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