A new study released on Wednesday found that humanity's first kiss occurred roughly 21 million years ago, predating humans.
Evolutionary biologists don’t know why we kiss — but new research suggests kissing evolved long before humans existed.
New research suggests that kissing probably predates humanity and evolved between 16.9 million and 21.5 million years ago, after the ancestor of the great apes split from the lesser apes, or gibbons.
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