Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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A man's beard grows fastest when he anticipates sex.
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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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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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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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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