A kiss is one of the most universal gestures in the world. It’s a wordless way to show affection that transcends language, ...

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

Romantic kissing likely evolved for the first time in a common ancestor of humans and other large apes about 21 million years ...

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.

The result was striking. Kissing almost certainly existed in the ancestor of today’s large apes, which lived somewhere ...

Intimate kissing (think lip-to-lip contact between two individuals in a sexual context) is typically the first partnered sexual behavior you experience. It's also the most common and the most frequent ...