Men who kiss their wives in the morning live five years longer than those who don't.
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Historically, sweat has been an active ingredient in perfume and love potions.
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When dragonflies mate, their tails form a love heart.
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Wearing red increases attraction.
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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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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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In 1999, a fisherman found a love letter in a bottle from a soldier in WWI. He returned said letter to the now deceased widows 86 year old daughter.
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