Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Speed dating was invented by a Rabbi in 1999.
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Wearing red increases attraction.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
Men who kiss their wives in the morning live five years longer than those who don't.
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Couples' personalities converge over time to make partners more and more similar.
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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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Historically, sweat has been an active ingredient in perfume and love potions.
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