Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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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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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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The typical person spends about 600 hours having sex between the ages of 20 and 70.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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