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.

Danish historians say evidence of the first mouth-to-mouth smooch can be found on a clay tablet unearthed in the Middle East, the New York Times reported, upending academic theory about which culture ...