Historically, sweat has been an active ingredient in perfume and love potions.
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Couples' personalities converge over time to make partners more and more similar.
235
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
16
Two in five people in the world marry their first love.
270
In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
456
The single biggest predictor of love is proximity.
30
People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
104