I think we really need to understand what the difference between fantasy and reality is. Because restricting fantasies on the basis of their merits when practiced in reality is insane.
Imagine this fantasy. You're sitting on the subway, and a naked girl (or guy, depending on your orientation) walks up to you. She (or he) is really hot, and she immediately unzips your pants and begins to manually and orally pleasure you. You then take her home and fuck her hard all day long, again and again, until you're both exhausted. Then she leaves and you never see each other again.
That fantasy is really fucking hot, right? You know why it's hot? It's hot because you don't have to worry about getting arrested for indecent exposure on the subway. You don't have to worry whether this girl (or guy) has any sexually transmitted diseases. And if it is a girl, you don't have to worry about getting her pregnant (you don't even have to concern yourself with whether or not the sex is safe). You also don't have to worry about the repercussions of skipping out on a day of work to have an all-day sex orgy. And you don't have to worry about seeing this person again in case you don't get along very well, either. There are no laws, no responsibilities, no consequences, none of the shit that so frequently gets in the way of having a good time in real life. It's just imagination.
Having these fantasies doesn't make you want to go out and perform them in the real world. Well, you might want to perform them, but you don't perform them just because you're thinking about them. You refrain from performing them for exactly the reasons why they shouldn't be performed (unless it's a fantasy that can be performed in reality without any problems - and there are plenty of those, too). There's no reason why you should be barred from thinking about (and enjoying) those fantasies in the safety of your own mind. And there's no reason why those fantasies should be restricted topics in the realm of creative fiction (audio, visual, literary - whatever).