Evolutionary biologists don’t know why we kiss — but new research suggests kissing evolved long before humans existed.

Learning how to French kiss can be easier said than done. But a little practice makes perfect, and few subjects are as fun to study. Because it’s true what they say: a truly amazing, off the wall, ...

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Our results paint early apes in an amorous light, showing that the ancestors of large apes were kissing each other as far ...