This link is to a thoughtful article on the subject from several years ago. Has the issue become clearer in recent years?
Here is another thoughtful article on the siubject.
The current Wikipedia link fails to add much clarity, for example:
- "All published neuroscience studies of internet porn users have found evidence of addiction related brain changes. However, current evidence is still not sufficient to conclude that visual images and films can be addictive"
- "Several studies conclude the liberalization of porn in society may be associated with decreased rape and sexual violence rates, suggest no effect, or are inconclusive"