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spent watching pornography was associated with differences in gray matter volume in a particular region of the brain.

For the investigation, scientists recruited 64 healthy males between the ages of 21-45.

Participants were asked to fill out surveys on the amount of time spent watching porn per week, which was found to vary considerably between participants.

Typically, the men were found to not spend more than 4 hours per week viewing pornographic material.

The brains of the men were then scanned using magnetic resonance imaging (MRI) whilst they were either being shown pornographic images or non-sexual images.

They found a negative association between time spent watching porn and gray matter volume of the right caudate of the striatum.

When the men were being shown pornographic material, the MRI scans also revealed an apparent decrease in function of a brain region known to process motivation.

Furthermore, functional connectivity between the right caudate and the left dorsolateral prefrontal cortex was negatively associated with the amount of reported time watching porn.

Since the researchers cannot prove that it is the porn that caused this decrease in gray matter volume, they have called for further investigation.

Future studies should investigate the effects of pornography longitudinally or expose nave participants to pornography and investigate causal effects over time, said the researchers.
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