Apparently, my tastes are rather humdrum and conventional. "Extreme" stuff is much more likely to make my eyes water or just go "ewww". But if you like that kind of thing, you need to be aware that "consenting adults" has gone out the window, and you can now be charged with having "extreme porn".
If you want to get rid of anything, there is some advice here.
PS ccleaner is also good for speeding up computers with crap in the registry, so even if you don't have any dodgy stuff on your computer, it's worth running. ;o)