'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
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You burn 26 calories in a one minute kiss.
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Kissing an infection-free partner is good for your teeth!
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When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
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Men who kiss their wives in the morning live five years longer than those who don't.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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