Wearing red increases attraction.
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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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In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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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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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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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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