Hald, Gert Martin; Malamuth, Neil 2008.
A number of studies have found neurological markers of addiction in Internet porn users, which is consistent with a large body of research finding similar markers in other kinds of problematic internet users.
Another 2016 review suggests that internet behaviors, including the use of pornography, be considered potentially addictive, and that problematic use of online pornography be considered an "internet-use disorder".
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Since those problems are a huge obstacle, it is likely that such research will not be allowed, thus possibly it could never be known.
"Self-Perceived Effects of Pornography Consumption".