How much violence is too much.
I recently submitted a story, and it got rejected for being too graphic "snuff". However I've read a lot of stories that have really pushed the line on being really graphic, making me cringe just a little at them (chicks getting gang raped, plotting murder, borderline torture, etc). I wasn't really trying to glorify abuse, but I have an antagonist who is basically one of those. Other than changing it up and making one character enjoy her encounter, which I don't know if I like that idea, and change the fight scene, where he really gets what's coming to him.