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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Two in five people in the world marry their first love.
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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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Speed dating was invented by a Rabbi in 1999.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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