When it comes to the physiology of kissing we are on slightly firmer ground. Our lips are among the most sensitive parts of our bodies, packed with sensory neurons linked to the brain's pleasure centres. Kissing has been shown to reduce levels of the stress hormone cortisol and increase the bonding hormone, oxytocin.
+ info: http://www.newscientist.com/article/mg20327201.500-10-mysteries-of-you-kissing.html
+ info: http://www.newscientist.com/article/mg20327201.500-10-mysteries-of-you-kissing.html
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