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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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One in five long-term love relationships began with one or both partners being involved with others.
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Historically, sweat has been an active ingredient in perfume and love potions.
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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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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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