In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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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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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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The average person will go on a date at least 100 times before they finally marry.
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Parents receive 1 out of every 5 Valentines.
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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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Historically, sweat has been an active ingredient in perfume and love potions.
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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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