When dragonflies mate, their tails form a love heart.
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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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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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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As a rule, 66 percent of people keep their eyes closed while kissing. The rest take pleasure in watching the emotions run the gamut on the faces of their partners.
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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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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Sea otters hold hands while sleeping so they don’t drift away from each other.
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