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Studies have shown that over-stimulation of reward circuitry results in localized insurrection. In order to lessen the quantity of dopamine it really is released, nerve cells cover the ear and reduce the variety of dopamine receptors. This makes it harder to withstand over-intake and may additionally lead to desensitization. A 2014 brain scan study showed a link between greater porn intake and greater desensitization. The users of porn were also found to have reduced reward circuit grey matter and reduced sexual arousal. In humans, here's called the Coolidge Effect. The researchers conducted an experiment where a single man had sex with a couple of women, exposing him to an erotic film. The topics' penises were attached to displays that monitored dopamine levels and arousal levels. After 18 viewings, the arousal level of the subjects reduced dramatically. This resulted in the emergence of an dependancy it's much more harmful than we predict. Dopamine has long been related with the excitement of novelty.

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