Kissing is mouth contact with slightly pursed lips. Kissing and being kissed is pleasant partly because it triggers subconscious memories and instincts of early childhood, of feeding at the mother's breast and of feeding babies.
Deep kissing, in which the mouths are pressed together and the tongues probe within each other's mouths is a popular and common part of pair bonding in human beings and originates, probably, from the way in which mothers fed their young many years ago. In early civilisations mothers would chew food for their toddler and then feed it to them by mouth-to-mouth contact which involved pushing the food into the child's mouth with the tongue, much like birds still feed their young. Psychologically, kissing is a subconscious reminder of this feeding and being fed instinct - it is a relic gesture - and helps pair bonding between lovers. Research Kissing
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