indirectly from the mouth, have their behavioural roots in higher animals and ancestral great apes.

Human kiss precursor

There is high similarity in the execution of kiss-feeding and human kisses (e.g. French kiss); in the former, the tongue is used to push food from mother to child with the child receiving both the mother's food and tongue in sucking movements, and the latter simply forgoes the premasticated food. In fact, observations across various species and cultures confirms that the act of

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