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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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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Historically, sweat has been an active ingredient in perfume and love potions.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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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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