@Jaded One of the things they tried to do was keep it not too far beyond what they had on FOX. 'Add a few butts here and there' was pretty much the extent of it. Possibly a LITTLE more language but not much -- this was actually something specifically cited as something they didn't want to push too far.
The reason why is actually pretty interesting: the show apparently had a much more broad than normal demographic of fans, many of which would be put off if they went too far in pushing what the new home allows. (More profanity, more nudity, more violence, etc.) They wanted to stay as true as possible to the show the existing fans -- which were so enthusiastic it's why Netflix nabbed it in the first place -- would stick with it and not suddenly be put off. I get that, and think it's pretty clever; it gives it more of a chance, too, I think, of getting us a potential season 5.