Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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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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Couples' personalities converge over time to make partners more and more similar.
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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According to the New York Times, a study conducted during the 1980's found that men who kiss their wives before leaving for work live longer, get into fewer car accidents, and have a higher income than married men who don't.
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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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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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