Sopho_Soph wrote:
Why do people do it then?
From a purely anthropological point of view, it may have arisen from the act of "kiss-feeding", where a parent animal feeds its offspring partially digested food through mouth-to-mouth contact (you see it most often in birds these days).
From a slightly less detached point of view... I guess it provides intimacy and trust between partners. Or it feels nice. Or something. I have no idea anyway, so that's probably just wild theory.
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Why so serious?