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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Couples' personalities converge over time to make partners more and more similar.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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Men fall in love faster than women do.
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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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Sea otters hold hands while sleeping so they don’t drift away from each other.
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