The theory that most people accept is that humans use this affectionate action to find a suitable mate. In such close quarters, pheromones are exchanged, giving you the “good vibe” or the “I’m-not-sure-about-this-guy” feeling. Women also subconsciously prefer the scent generated by men whose genes for certain immune system proteins differ from their own. This kind of match could yield offspring with stronger immune systems and better chances of survival.
Source:Swaave.com
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I have not checked in here for a while as I thought it was getting boring, but the last several posts are good quality so I guess I will add you back to my daily bloglist. You deserve it my friend 🙂