Part of my previous insight is related to experience working with people to get their own book published. During that I found out a lot of publishers will just redirect you to a different division who does NSFW content under a different name, in fact they are actively seeking to find out if they should redirect you or not more than anything.Thats also a good point.
His Very fetish outlook on things in his universe will undoubtly make it harder for him to make sales, cause of all of the beheadings/Ejaculating on corpses/Obvious fetish bait world and all of that.
That could easily limit him down even more on who prints and sells the book.
Printing a self published book however, so long as it breaks no laws, is pretty easy. They ask no questions beyond those of production. Sellers are also not to picky, as most sellers are happy to sell smut.
The big concerns are the cover, the sample chapter, and legality of content. After that they just hide the more fucked up shit far deeper in their system.
