Researchers trace the origins of the first kiss to early primates 20 million years ago, revealing the deep roots of human ...

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

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.

Kissing did not begin with star-crossed human lovers but with the primate ancestors of great apes around 20 million years ago ...