Humans spend a lot more time kissing than they do thinking about why they kiss. But scientists intrigued by this question say ...

Kissing is something of a mystery, being "only documented in 46 percent of human cultures," noted psychologist Catherine ...

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

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

It is not a recent cultural development. A new study in Evolution and Human Behavior suggests kissing may date back 21 ...