It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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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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Couples' personalities converge over time to make partners more and more similar.
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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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Twenty nine percent of women spend more time shopping for shoes than they do looking for a life long mate.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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