Why do humans kiss?

How did smooshing our faces together come to signify love and affection?

As we've written about previously, one of the most compelling explanations hinges on the practice of mouth-feeding – the passing of pre-chewed or regurgitated food from the mouth of one animal to another. Lots of species, including humans, are known to mouth-feed. But when and why did we make the leap from mouth-to-mouth feeding to full-blown makeout sessions?

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In the latest episode of VSauce, Michael Stevens runs us through a slew of fascinating studies with ties to philematology (the science and study of kissing). Some damn interesting research in this roundup – including several investigations that would have a hard time passing today's institutional review boards.

[VSauce]

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