Two in five people in the world marry their first love.
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Parents receive 1 out of every 5 Valentines.
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40% of people who are rejected in romantic love slip into clinical depression.
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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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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39
Couples' personalities converge over time to make partners more and more similar.
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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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