Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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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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One in five long-term love relationships began with one or both partners being involved with others.
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Couples' personalities converge over time to make partners more and more similar.
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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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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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When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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