Watching birds "kissing", I assumed that I was seeing parents feeding their young. Then someone told me it was part of a mating ritual whereby the female showed her readiness to mate and the male passed a titbit of food to her. I understood that human kissing had evolved from mothers chewing and moistening food so that infants could digest it long before we had baby food in jars. But that did not explain the evolution of passionate, sexual kissing. So perhaps our adult kissing also evolved from passing food from mouth to mouth - ugh!
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