Gary Wilson's Your Brain on Porn is a problematic source. It's not a peer reviewed academic source and its citations should be taken with a pinch of salt. The tone of the website often appears downright unhinged, especially when discussing the work of clinical experts such as neuroscientist Nicole Prouse.

https://en.wikipedia.org/wiki/Gary_Wilson_(author)

https://en.wikipedia.org/wiki/Nicole_Prause

Clinical Psychologist David Ley's publishing history includes many relevant contributions to peer reviewed publications.

https://www.davidleyphd.com/publications

https://en.wikipedia.org/wiki/David_J._Ley

Neither APA's DSM-V nor WHO's ICD-11 recognise any addiction disorder related to pornography. While ICD-11 recognises compulsive sexual behaviour disorder (CSBD), the absence of a close fit to established addiction models has been remarked. On the other hand, there is a substantial cottage industry based on this pseudoscientific concept.