'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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Men fall in love faster than women do.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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Parents receive 1 out of every 5 Valentines.
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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