Couples' personalities converge over time to make partners more and more similar.
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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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The single biggest predictor of love is proximity.
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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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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