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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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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40% of people who are rejected in romantic love slip into clinical depression.
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Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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The average person will go on a date at least 100 times before they finally marry.
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Men who kiss their wives in the morning live five years longer than those who don't.
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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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