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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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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Historically, sweat has been an active ingredient in perfume and love potions.
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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Two in five people in the world marry their first love.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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