Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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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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The single biggest predictor of love is proximity.
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A man's beard grows fastest when he anticipates sex.
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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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Kissing an infection-free partner is good for your teeth!
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Men fall in love faster than women do.
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In Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
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