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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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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Men who kiss their wives in the morning live five years longer than those who don't.
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A man's beard grows fastest when he anticipates sex.
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Couples' personalities converge over time to make partners more and more similar.
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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