When dragonflies mate, their tails form a love heart.
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Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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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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Historically, sweat has been an active ingredient in perfume and love potions.
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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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Sea otters hold hands while sleeping so they don’t drift away from each other.
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Two in five people in the world marry their first love.
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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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