People respond to incentives. They must've figured out at some point that using attractive models for advertising sells better to normal, average people. Not all models you have on hand will be attractive enough for the magazine, so they can supplement with Photoshop. Even if you regulate away Photoshop usage in the marketing/advertising industry, they'd just have to start only hiring super attractive models right? Maybe we could force companies to use average looking models? I don't know, but there's a lot of ways you could approach it. The simplest but most difficult solution is to change people. I know the first reaction is to think that "Wow, it's all those pervert men's fault for these absurd norms and expectations of women!" but then I remember these are advertisements targeted to women. What to do?