In this study, this study, and this study, it was found that people who were extroverts, outgoing and social had more D2 receptors in their brain (this is an oversimplification of the results. Link is provided for more detailed read.
It has been shown through the science of addiction and fMRI scans that the brain chemistry of the porn addict mimics the brain chemistry of addicts with other forms of addiction. These brain chemistry are characterized by hypofrontality (memory and cognitive impairment) and largely reduced number of D2 Receptors.
Actually, hypofrontality is a nice way of saying retardation since it refers to incomplete development or function. That’s literally what a retard is, the word meaning slow in French.
So they are literally retarding themselves, the wankers.
COMMENTS: First study to show that drug use causes a decline in dopamine (D2) receptors. Important because addicts have a low number of such receptors, which may contribute to addiction. Also shows that receptors can bounce back, but rate is highly variable and not related to baseline D2 receptors.