One in five long-term love relationships began with one or both partners being involved with others.
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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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40% of people who are rejected in romantic love slip into clinical depression.
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Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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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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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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