Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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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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Two in five people in the world marry their first love.
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Men who kiss their wives in the morning live five years longer than those who don't.
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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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