I understand, but I feel that fantasy doesn't make a difference. I used to be attracted to certain...things...but as I matured I came to the realization that they were immoral and the fact that it was a fantasy that I didn't technically "want" to take place didn't make it any less immoral in my eyes. So I stopped fantasizing about those things.
I understand some people are born with urges that are very powerful and almost uncontrollable, and not knowing what that's like myself I will not pass judgement. However, myself I have a normal sex drive that is not some insurmountably powerful force, and so I can refrain from fantasizing about things I find wrong and even modify my own preferences so that I no longer find them attractive (now I see something like that, and it's just disgusting to me and not sexy in the slightest). Therefore I will at least hold myself to my own values.
Lord of The Rings was also made into a movie, and there is sexuality and sex scenes in classical literature, but that being said if you were going to do a visual spin off or some such things of the LOTR universe, any kind of "fan service" would feel very jarring. As for the religious symbolism, Tolkien said many times that he had a distaste for allegory and tried to focus purely on story telling that could appeal to everyone.
Anyway, my main point is that it wouldn't really fit due to the atmosphere and style.