Ironically I think you can place quite a bit of blame on the 50 shades of grey trilogy for the spike in crappily written, over-the-top, borderline offensive/criminal stories. There is quite a fine line sometimes between erotica and some quite unpleasant stuff.
That said, there are those who are 'turned' on by the violent, offensive etc stuff, that is their 'fetish'. There is quite a market for Vorarephilia, which would make many want to be sick. (google it if you dare
)
Well written erotica is fantastic, and yes I do write it sometimes, and yes I would publish it.