One in five long-term love relationships began with one or both partners being involved with others.
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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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Two in five people in the world marry their first love.
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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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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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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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