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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.
You should try to: 1  Avoid kissing when you or the other person is sick. 2  Avoid kissing anyone on the lips when you, or they, have an active cold sore, warts or ulcers around the lips or in the mouth. 3  Maintain good oral hygiene.  Cough and sneeze into a hanky if you have a 1  cold. See your doctor about immunisations.