Historically, sweat has been an active ingredient in perfume and love potions.
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Couples' personalities converge over time to make partners more and more similar.
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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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Men who kiss their wives in the morning live five years longer than those who don't.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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