Whether you’ve been together forever or are still getting to know each other, these questions will strengthen your bond.

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

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

In the words of Dua Lipa, one kiss is all it took about 21 million years ago. That's roughly when scientists estimate that ...