A possible explanation is that watching porn results in psychological tolerance where you get desensitized and more and more porn is required over time for the same feeling.
academic.oup.com/milmed/advance…
According to social cognitive theory, viewers who watch such media will be more likely to abuse women.
journals.sagepub.com/doi/abs/10.117…
Nor was this was not moderated by, age, gender, or nationality.
academic.oup.com/joc/article-ab…