While kissing might feel like one of the most natural things in the world, this familiar behavior is quite mysterious—various animals also kiss, despite a lack of practical benefits and a real risk of ...

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 ...

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 ...

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 ...