Kissing is popular among almost all cultures

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Kissing is practised in 90 per cent of all cultures, says Gordon Gallup, a psychologist at the University of Albany, N.Y. Our closest animal relatives kiss to show affection, which would suggest the human race inherited kissing from our ape predecessors. In his book Our Inner Ape, primatologist Frans de Waal writes that chimps kiss with their mouths closed, but not their close relatives, the bonobos, who engage in a form of tongue kissing so humanlike that it never fails to shock Dr. de Waal's students.

Source: The Philadelphia Inquire