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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One in five long-term love relationships began with one or both partners being involved with others.
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The left ear is more responsive to words of love and emotion whispered into it than the right.
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Kissing an infection-free partner is good for your teeth!
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A poll has found that computer 'nerds' make the best lovers, with 82 percent of IT geeks claiming they put their partner's pleasure above their own.
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In Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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