Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. “The meeting of ...

In romantic relationships, a kiss is often seen as the gateway to intimacy. It's a sensual gesture that can ignite sparks, communicate affection, and deepen the connection between two people. Of the ...

For humans, kissing holds major cultural cachet, accompanying confessions of romantic love, religious rituals of reverence and even betrayals, à la The Godfather Part II’s “kiss of death.” New ...

Ingrid Bergman is said to have uttered one of the most notable definitions of the act of touching lips: “A kiss is a lovely trick designed by nature to stop speech when words become superfluous.” Some ...