Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Historically, sweat has been an active ingredient in perfume and love potions.
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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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A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
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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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Kissing an infection-free partner is good for your teeth!
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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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According to the New York Times, a study conducted during the 1980's found that men who kiss their wives before leaving for work live longer, get into fewer car accidents, and have a higher income than married men who don't.
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