Kissing, for all popularity, is a bit of a mystery. Scientists have long debated when humans’ ancestors first put their lips together, and whether the act is simply a cultural trait. A new study ...

Stories have long been swapped on awkward first kisses and princesses smooching frogs, but a new study suggests the earliest instance of two lips pressing together happened up to 21 million years ago ...

Kissing occurred around 21.5 to 16.9 million years ago, the researchers said. Stories have long been swapped on awkward first kisses and princesses smooching frogs, but a new study suggests the ...