Ignoring your example, because I respond to substance and not rhetoric, I think you read my post through the filter of knowing that I am a Deist and missed a little of what I was trying to say.
First, let me point out that I did not say that I personally viewed sex-without-meaning in fantasy as morally inferior to sex-with-meaning in fantasy. I haven't actually said anything in this thread about my value judgment on that issue, even though I have indicated that I deem sex-with-meaning in reality to be morally superior to sex-without-meaning (which you correctly deduce as stemming from my own theology).
Second, I specifically pointed out that people can believe that sex-with-meaning is morally superior to sex-without-meaning for various reasons: because society tells them too, because of theology, because they believe in innate morality independent of that.
There are people who believe in morality without theology - or at least think they do (personally, I think the 'non-believing' are far more influenced by being socialized in a religious world than they might think they are, though this is a tangent).
As a Deist, I find morality without theology incoherent, but I don't find it nearly as incoherent as moral relativism. My suspicion, based on your comment about the literary world not posing any threats of exploitation, is that you believe in morality without theology rather than complete relativism. Otherwise, why would exploitation be wrong? But I don't purport to know what you believe.
At the end of the day, if you are posting to say "Aha! See! You can't do anything without being informed by your theology," then by all means, you are correct. My belief core shapes my view of the outside world, and my view of the outside world informs my beliefs. It is a complementary cycle.
But if you are posting to say, "I disagree with you, because you're just giving things value judgments based on your beliefs. There is no such thing as a bad fantasy, because nothing is really 'bad,'" then we fundamentally disagree on the existence of morality.
If you are posting to say "I disagree with you, because you're just giving things value judgments based on your beliefs. There is no such thing as a bad fantasy, because fantasies are harmless," then we fundamentally disagree on the source of morality. You have decided that fantasies are all ok based on the value that 'if no one gets hurt, it is ok.' The fact that you have no specific theology in mind does not make this any less a value judgment. Nor does it even mean that our specific values - despite their different origins - differ in this regard.