Historically, sweat has been an active ingredient in perfume and love potions.
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Kissing an infection-free partner is good for your teeth!
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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Couples' personalities converge over time to make partners more and more similar.
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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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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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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