When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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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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