Men who kiss their wives in the morning live five years longer than those who don't.
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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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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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You burn 26 calories in a one minute kiss.
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Couples' personalities converge over time to make partners more and more similar.
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