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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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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Raj from the Big Bang Theory is married to Miss India.
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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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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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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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