What makes us exchange saliva, sebum, bits of food and millions of bacteria with each other?聽In other words, why do we kiss?聽This is not an innate activity.聽South Pacific islanders, for example, were great lovers before the Europeans arrived but never kissed.聽Even in Europe kissing was sometimes frowned upon.聽In the Middle Ages the Catholic Church decreed that kissing with the intent to fornicate was a mortal sin!聽But actually a kiss may be a scientific prelude to such activity.聽Studies have shown that women subconsciously prefer the smell of men who have different immune system proteins than their own.聽Mixing immune system proteins can result in healthier offspring!
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