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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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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40% of people who are rejected in romantic love slip into clinical depression.
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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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A man's beard grows fastest when he anticipates sex.
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You burn 26 calories in a one minute kiss.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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