When dragonflies mate, their tails form a love heart.
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Historically, sweat has been an active ingredient in perfume and love potions.
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Cuddling (or other ‘love’ acts) helps to heal physical wounds faster due to the release of Oxytocin which is proven to reduce swelling.
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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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In Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
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