Did you know that a kiss is an exchange of bacteria?

A kiss is a A kiss is a great exchange of bacteria. Fortunately, all those foreign bacteria that pass into your mouth barely live a day.

According to a study, a single passionate kiss promotes the transfer of up to 1 billion bacteria from one mouth to another, along with about 0.7 milligrams of protein, 0.45 milligrams of salt, 0.7 micrograms of fat and 0.2 micrograms of “various organic compounds”, which in Roman paladino means “food remains”.

However, microbes tend to jealously defend their territory, so after the kiss, as Bill Bryson explains in The Human Body:

The host microorganisms on the two people involved begin a kind of gigantic cleansing process, and in a matter of a day or so the microbial profile of both parties will have been more or less fully restored to what they were before they intertwined their tongues. Every once in a while some pathogens sneak in, and that’s when we catch a cold or herpes, but that’s the exception rather than the rule.

During the Middle Ages it was decreed that the kiss, like the love game or the preliminaries in general, were reprehensible. And Sigmund Freud classified the kiss as “perversion” in his Three Essays on the Theory of Sexuality. And that they did not know about this multimillion-dollar miscegenation of bacteria.

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