Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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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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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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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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Men fall in love faster than women do.
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