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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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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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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Sea otters hold hands while sleeping so they don’t drift away from each other.
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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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'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
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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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