One in five long-term love relationships began with one or both partners being involved with others.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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When dragonflies mate, their tails form a love heart.
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As a rule, 66 percent of people keep their eyes closed while kissing. The rest take pleasure in watching the emotions run the gamut on the faces of their partners.
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