One in five long-term love relationships began with one or both partners being involved with others.
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Couples' personalities converge over time to make partners more and more similar.
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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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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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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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