And here is that again. A lot of insightful and good points were already mentioned, so I won't repeat them. I'll just try to clarify and give a bit of insight on my personal opinion(s) about NT.
It is because this has already been discussed, and if I remember correctly it was turned down because it would be, if we were following what Zephyr's ideas for NT are, a TON of work. You'd have to either rewrite EVERYTHING about NT or rewrite half the stuff and delete the other half for this to make sense. Because it would affect everyone on NT, you would have to rewrite every talk-, sex-, purchase- and quest-scene, or at least most of them, and spending that much time for a small side-planet is just not worth that time (something that also has been discussed while NT was the main focus of development, since there was less time for other things to get written and/or coded). In short my own opinion on this: Please stop trying to fix everything that displeases you, because you will not be able to do that. If you do not like the fetishes that NT offers, do not visit it or just visit the gym and nothing else and you should be fine.
It is because originally these forms of the treatment were supposed to be rare. Problem is that rare stuff appeals to people, so now we have three rarities among the 18? (not counting the turkey, because silly and nonexistant in my own headcanon) encounterable inhabitants, which makes them not that rare anymore. I'd call that a loophole or something similar. They are supposed to be rare exotics, not really part of the main populance of NT as a planet. I do not mean that they are cast-out or something alike, but they do not play a significant role in NT's planetary society, so they have no say in politics or any social matter. At least that is how I explain this to myself.
I have a thing for openly forced, or socially forced sexuality and sexual behaviour, as long as extreme doses of it do not occur in reality. Social standarts regarding sexuality are a thing everywhere, this should go without saying. I am not the person to force anyone to do pretty much anything, I like to listen to and understand other points of view. I don't even like to persuade others to step away from their point of view because it is silly or dangerous, because I can and mostly do relate to them and their background and situation. That is not really the point, although it might explain my fetish for forced sexuality. The point is TiTS is NOT reality, but it reflects on and imitates reality up to a point where it is possible and beneficial for the gaming experience. Being able to change NT to be a planet of "free" will and to destroy NT's social system (that has been around quite a while longer that the player character) is way out of the PC's scope (realistically speaking). Also the social and personal aftermath for the people of NT would be chaotic if not catastrophic. Another point is the already mentioned work for such a thing, this may be stuff for it's own game, but NT does not have that.