One in five long-term love relationships began with one or both partners being involved with others.
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40% of people who are rejected in romantic love slip into clinical depression.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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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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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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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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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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