Raj from the Big Bang Theory is married to Miss India.
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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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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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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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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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Couples' personalities converge over time to make partners more and more similar.
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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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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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