Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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40% of people who are rejected in romantic love slip into clinical depression.
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In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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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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A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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