>>101129553Because it's all done by people tracing preious cartoon characters, many of which were designed without sensual appeal.
Flynn Rider, Prince Naveen, and the guys from El Dorado are sexy cartoon men. Mr. Incredible, Homer Simpson, and the guys on your cover there (ESPECIALLY the guy on the right) aren't.
Why are they traced, you ask?
Because most people with the talent to do character design don't want to A) 'waste' it on something as disposable as erotica, or B) dont want porn to be tied to their mainstream image. Contrary to popular belief, there's more money in legit industry work, in America at least, than porn that gets pirated twenty minutes after purchase.