I think part of the idea might be similar to seeing minorities repeatedly cast/portrayed in stereotypical roles in movies. It's thought to be a big deal of late with films like Hidden Figures or people like President Obama to have people viewing as intelligent leaders in film and real life instead.
If a guy is consuming a ton of porn, and he's watching women take it in the ass all day, even if it's not conscious, that kind of thing seems like it'd leave an impression on how he views and treats women.
If a guy is consuming a ton of porn, and he's watching women take it in the ass all day, even if it's not conscious, that kind of thing seems like it'd leave an impression on how he views and treats women.