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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Wearing red increases attraction.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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In 1999, a fisherman found a love letter in a bottle from a soldier in WWI. He returned said letter to the now deceased widows 86 year old daughter.
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Couples' personalities converge over time to make partners more and more similar.
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'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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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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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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