Raj from the Big Bang Theory is married to Miss India.
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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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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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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 Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
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