Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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40% of people who are rejected in romantic love slip into clinical depression.
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You burn 26 calories in a one minute kiss.
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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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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Couples' personalities converge over time to make partners more and more similar.
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