A new study published in Evolutionary Anthropology suggests that all types of kisses stem from a grooming practice in which chimpanzees and other great apes engage, combing each other's fur and using lips to remove debris.
Kissing may seem like a strange way of showing affection, as we put our lips together and make sucking gestures that are random and intuitive. But its origins trace back to primate grooming rituals.
Several theories exist about the evolution of kissing: attractive lips, smelling for compatibility, premastication, and echoes of breastfeeding all play roles in this unique form of human connection.
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