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What's in a KISS?

Neuroscientists point out that such kissing employs the lips and tongue; highly sensitive areas with lots of afferent neurons sending signals to the brain to release endorphins. These make us go all gooey. Kissing helps prevent hormone-glucocorticoids from forming which can result in stress and high cholesterol. Instead, kissing creates an adrenaline rush which combats hydrocortisone, a stress hormone. Kissing burns up calories in exercising dozens of little face muscles, increasing blood circulation which helps smooth out wrinkles.

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Uploaded on December 24, 2009
Taken on December 20, 2009