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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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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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You burn 26 calories in a one minute kiss.
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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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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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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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Couples' personalities converge over time to make partners more and more similar.
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