Our ancient primate relatives—including Neanderthals—may have enjoyed a nice peck on the lips. But researchers still don’t ...

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

Scientists have found evidence suggesting that kissing dates back up to 21 million years and that our ape ancestors and ...

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

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

A recent study suggests kissing originated approximately 21 million years ago, predating modern humans and possibly emerging ...