Why Do We Kiss?

Somethings in life seem so natural we rarely ever stop and think about why we are so obsessed with them. Like kissing. Why exactly do we kiss in the first place, wondered Hank Green on Sci Show.

There are two popular theories. One says kissing is a learned behavior, perhaps learned from regurgitation. Others argue that kissing is natural and instinctual, as many other apes seem to express kissing type behavior.

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