Probably should clarify.
Don't write flat out porn, meaning page after page of sex scenes. You can get away with a non-graphic sex scene here and there if the story calls for it.
While violence as usual gets the double standard of being allowed a lot more (Yay!), somebody getting their head chopped off or their head blown off in a battle scene is pretty standard fair. Even if you go on to say something like "Suddenly a shotgun slug hits your skull, spectacularly shattering bone fragments and splatting your brains across the wall."
You're still good.
Somebody getting brutally tortured and graphic description of said torture is where it starts pushing it. Depends on how you're doing it though.
If you're going for over the top dark morbid comedy where the psycho is saying funny stuff while he's doing all these things then it probably "lessens" the impact of such a horrible thing. (Love SICK isn't even the story I get the most complaints about.)
If you're writing a more serious story where there isn't anything funny about any of the violence, then I'd highly suggest you space out such scenes and make a really good effort of tying a proper storyline between all the graphic violence.
Of course this also brings up the even greater question of sexual violence…well I'd try to avoid making it an ongoing thing. I mean if the story really calls for it, then use your judgment of exactly how graphic you want to get with it, but you probably can include the "act" without going into the play by play details excessively.
