Kissing is not a universal expression of romantic love, it turns out. Kissing is considered a sign of sexual attraction in less than half of the world's societies, according to a recent study. The ...

BLOOMINGTON, Ind. -- For generations, passionate kisses immortalized in movies, songs and the arts have served as a thermometer of romantic affection. But current research has found that not only is ...

New research into Ancient Mesopotamia suggests people kissed romantically 4,500 years ago. The finding would mean humans began kissing 1,000 years earlier than previously thought. The article ...

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 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 ...