Historically, sweat has been an active ingredient in perfume and love potions.
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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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Couples' personalities converge over time to make partners more and more similar.
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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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Men who kiss their wives in the morning live five years longer than those who don't.
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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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