Yes, it is ok and beautiful to use anime hentai wallpaper for desktop.
Its awesome to use it nice
In fact, I don't think so. It's better to set something that isn't 18+. You can have a porn games catalog on your PC but when porn is on your set as a desktop picture, it doesn't seem to be fine imo. Do you really like hentai all that much? Never was able to understand why some people are so into it.