Today, the most widely accepted theory of kissing is that humans do it because it helps us sniff out a quality mate. When our faces are close together, our pheromones “talk” – exchanging biological information about whether or not two people will make strong offspring. Women, for example, subconsciously prefer the scent of men whose genes for certain immune system proteins are different from their own. This kind of match could yield offspring with stronger immune systems, and better chances for survival. Still, most people are satisfied with the explanation that humans kiss because it feels good. Our lips and tongues are packed with nerve endings, which help intensify all those dizzying sensations of being in love when we press our mouths to someone else’s. Experiencing such feelings doesn’t usually make us think too hard about why we kiss – instead, it drives us to find ways to do it more often.
Interesting article. Catch the whole read here: http://www.scienceline.org/2006/10/02/ask-fiore-kiss/
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