You guys do realise that six, Molag Bal's fun, swearing and sixual references are actually in the game, already? I don't see any problem with expanding on any of these, as long as it's done in a mature way. Really annoyed me how six in Fable 2 was just for lols. I mean, I'm not asking for a graphic six scene... I would actually be fine with something like Fable's system, without all the stupid jokes.
Crime and six related subjects can often add corruption and atmosphere to a game. I see no reason to disclude any of it.
Oh, and for an example of maturity, look at Daggerfall's nudity. It wasn't all "lol bewbz", like most games. They where usually there for a reason. Mannimarco's naked slaves, for example, where there to fullfill his lustful desires. Yet, there where no stupid sixual jokes made.