Two in five people in the world marry their first love.
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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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According to the New York Times, a study conducted during the 1980's found that men who kiss their wives before leaving for work live longer, get into fewer car accidents, and have a higher income than married men who don't.
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One in five long-term love relationships began with one or both partners being involved with others.
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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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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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Men who kiss their wives in the morning live five years longer than those who don't.
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