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In page Judith Reisman:

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Endorphins are substances produced by the brain as a result of various things including sexual arousal, physical exercise, strong pain, laughter, etc. They cause pleasurable sensations and are somewhat addictive; drugs like morphine attach to the same receptors as endorphins. However, endorphins do not fit Reisman's definition of erototoxins, as many things cause them to be released, not only pornography.[citation needed]