In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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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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A poll has found that computer 'nerds' make the best lovers, with 82 percent of IT geeks claiming they put their partner's pleasure above their own.
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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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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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Couples' personalities converge over time to make partners more and more similar.
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The average person will go on a date at least 100 times before they finally marry.
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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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