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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.
There are 3 main causes of lip lines. 1. Repetitive use of the muscles for lip movement. Every time you speak, eat, kiss, or smile, your using the muscles around your mouth to move your lips. The more we use these muscles over the years, the higher the likelihood of developing deep wrinkles around the mouth. 2.