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 ...

In his 1971 book Love and Hate, my one-time PhD mentor Irenäeus Eilbl-Eibesfeldt suggested one promising possibility. He proposed that mouth-to-mouth kissing began with direct transfer of pre-chewed ...

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 ...