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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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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When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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40% of people who are rejected in romantic love slip into clinical depression.
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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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Couples' personalities converge over time to make partners more and more similar.
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