It's
basically just the materiel you use to
masturbate, when you are lonely at night, and regular porn doesn't fill that
depressing loneliness. Imagine you are lonely and you can't cum, and you really need to feel plesure, after having a hard day. What do you do? You try something different. Often consisting of all sorts of hentai, or in very special cases, two dwars shitting in each others assholes.