A single kiss can leave a lasting impression, whether it's in real life or on the silver screen. But why, exactly?

A kiss is one of the most universal gestures in the world. It’s a wordless way to show affection that transcends language, culture, and even species boundaries, conveying a great deal of meaning ...

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 ...

In the Western world, Valentine’s Day expressions of affection are closely linked to mouth-to-mouth kisses. I remember feeling envious years ago when a colleague found a card in his pigeon-hole ...