The average person will go on a date at least 100 times before they finally marry.
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Couples' personalities converge over time to make partners more and more similar.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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