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One possibility is that it is a learned behavior that evolved from kiss feeding, the process by which mothers in some cultures feed their babies by passing masticated food from mouth-to-mouth. However, there are some contemporary indigenous cultures which still practice kiss feeding, but not social or erotic kissing.
8 Health Benefits of Kissing Kissing not only feels good, it's good for you. It relieves stress and releases epinephrine into your blood, making it pump faster, which may result in a reduction of LDL cholesterol.