The idea is that because sex releases dopamine in the brain and provides a momentary high just as many drugs do, problematic sexual behavior could be understood as being very much like a chemical dependency.

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This careful, sometimes precarious, balance between rational and emotional can easily go off kilter when the brain locks into the evolutionary imperative that is sex.

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In fact, a battery of studies by Diana Tamir and Jason Mitchell of the Department of Psychology at Harvard University found that talking about ourselves lights up the same brain pleasure centers as food, money and sex.

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The EU scientific committee for vetinerary measures has warned that all sex hormones used in the US could pose a risk of cancer, genetic problems and brain disease, and claims children are most at risk.

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