A person can indeed become addicted to (or at least, dependent upon) the pleasureable cocktail of biochemicals that are produced/released, upon orgasm. The reason why it's easier for masturbation to become addictive, i.e. easier than it is to become addicted to having with sex with other persons, is because masturbation requires a lot less emotional work and utterly no personal commitment. (It usually requires less physical exertion, as well.) And, of course, masturbation is all about self interest/gratification, which is what's at the core of any addiction.
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