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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
130
Couples' personalities converge over time to make partners more and more similar.
235
Men who kiss their wives in the morning live five years longer than those who don't.
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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
104
Parents receive 1 out of every 5 Valentines.
20