So, without going into too much detail for the younger audiences...
What do you think constitutes as 'debauched, sickening and otherwise abhorrent' as per Slaaneshi worshipping is concerned.
To me, much of the acts that games worship comes out with seems pretty tame. Flaying and skin wearing is pretty brutal, but either I'm jaded to it, or it's just not exciting enough. Then you have the pirate prince campaign in the Tome of Excess, but even then, nothing is excessive to the point of revulsion. It's just extravagant.
Please hit me with your ideas. Pain and fear mongering ring seem the mundane of Slaaneshi worship. Without going into detail on the public forums, for the children of course...