I think it really can be an addiction. It's a real physical and mental high for your body. I've heard people describe an addiction to pornography, and I asssume that this is what they meant.
You should try not to indulge more than you have to or it will only become more and more of a habit. If you keep it up you may well get to the point where you really are unable to stop, and if you have a steady girlfriend, she might not be too keen on it.
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