'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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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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You burn 26 calories in a one minute kiss.
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The average person will go on a date at least 100 times before they finally marry.
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In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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