'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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Two in five people in the world marry their first love.
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Raj from the Big Bang Theory is married to Miss India.
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Historically, sweat has been an active ingredient in perfume and love potions.
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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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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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