For now, there is quite a road blocker as to payment handling.
First as to who will take the money.
2nd as to who handle it (direct bank ? Not the usual practice..).
3rd long term efficive, as it is, out of finding a country who has no specialy locking laws, guess its nearly world wide that most adults are either "hidden" or directly banned.
Of course, not without good reason, as humans are more changed by bad than good. Then, bad moves having more (direct and lasting) effects.....
Not an easy topic at all as it is.
That said, there is some hope, mainly as to openmw and some others community created engines. As it is its not that bright (there is not enough contributions as to the assets providing/creating).
Then, the devellopment is ongoing, so its a matter of months until there is a gnu engine supporting efficient scripts, 3D graphic and provided along with a quite friendly (and powerful) editor. This said, it seem there is some need to, which could lead for the engine to be released before the editor..
Last update added in shadows, quite something neat
Then, do you know which mode was the most used & downloaded for TESIII ?
Better Body (ies).
Beth did not take much care when creating either skeleton or meshs, even textures where (which is quite true even now for nearly all released games, if not even more widely effectiv ?).
Then, there has been a community dedicated to adults mod for that game for years.
This said, out of a big and diverse enough texture & meshes database the base setting is medieval, even if finding more recent items and textures is not that difficult (or not, as finding something success & adequation rate is quite individually defined).
If there the community goes along and provide the project support, what could be done then is close to limitless.
As it is, it was already possible from vanilla to walk, run, swim (baddly) and jump (one type).
Mods added climbing, boat both scenic and directed, levitation (improved). With the new engine + uptodate script language ..
To be seen.