The typical person spends about 600 hours having sex between the ages of 20 and 70.
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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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One in five long-term love relationships began with one or both partners being involved with others.
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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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Wearing red increases attraction.
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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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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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