The single biggest predictor of love is proximity.
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'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
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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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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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Couples' personalities converge over time to make partners more and more similar.
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Parents receive 1 out of every 5 Valentines.
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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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