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Kissing is culturally shaped, not a universal or purely instinctive human behaviour.

Across history, kisses have expressed power, faith, loyalty, love, and desire.

The kiss reveals how societies negotiate the boundary between self and other.

Kissing is not universal among human beings, and, even today, there are some cultures that have no place for it. This suggests that the behaviour is not purely innate or intuitive, as it may seem to us, but culturally shaped and historically variable—one of the ways in which human beings negotiate the boundary between self and other.

It could be that kissing is a learnt behaviour that developed from "kiss feeding," the process by which mothers in some cultures feed their infants by passing masticated food from mouth to mouth. Yet, there are some present-day indigenous cultures that practise kiss feeding but not social kissing. Another possibility is that kissing is a culturally determined form of grooming behaviour, or, in the case of deep or erotic kissing, a representation of, substitute for, and complement to penetrative intercourse.

Whatever the case, kissing behaviour is not specific or unique to human beings. Primates such as bonobo apes frequently kiss one another, dogs and cats lick and nuzzle one another and members of other species, and even snails and insects engage in antennal play. It could be that, rather than kissing, these animals are in fact grooming, smelling, or communicating with one another, but even so, their behaviour implies and strengthens trust and bonding.

Vedic texts from Ancient India seem to talk about kissing, and the Kama Sutra, which probably dates back to the second century CE, devotes an entire chapter to modes of kissing. Certain anthropologists have suggested that the........

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