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

A new study released on Wednesday found that humanity's first kiss occurred roughly 21 million years ago, predating humans.

Kissing is more than just “mouth-to-mouth” touching, and the study doesn’t really shed much light on why humans kiss the way ...

"A comparative approach to the evolution of kissing," was published by Evolution and Human Behavior on Nov. 19 ...