The single biggest predictor of love is proximity.
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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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Wearing red increases attraction.
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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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Couples' personalities converge over time to make partners more and more similar.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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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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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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