It's a single-player game, in my opinion you're free to do with it as long as it harms noone. The question is if the Nexus should host such files that could be considered unsettling or offensive; there are plenty of other mod sites around that allow every kind of perversion to be posted and publicly indulged. And I think this website here has found a nice middle ground; most mods, even those contanining clearly pornographic material, are allowed. But it usually stops short of sexualised violence and stuff involving children. That's good enough for me. If someone can't handle those, there's always the option of turning on filters for nudity.