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Kissing-like behaviors exist across the animal kingdom. But why? A scientist explains why humans are so drawn to each other's lips, and a photographer documents the power of a kiss. Among the many ...

A new study that examines how kissing evolved suggests that ape ancestors and early humans like Neanderthals probably locked lips with their friends and sexual partners. The behavior may date back 21 ...

How often do you kiss your partner? Every day? Once a week? Almost never? Did you and your partner kiss the last time you had sex? Not at all? Just a little bit? Or, perhaps, a lot? According to new ...