Like me, you might not like porn - I really have other interests, and I wouldn't waste my internet bandwidth on it - but certainly don't place myself in the position where I think I should tell people what they should be allowed to do or watch in private and on their own time - as long as it doesn't hurt anyone, of course.
Now, aside from murder, rape, pedophilia and grand theft, I can't think of any reason why adult porn could be harmful to anyone.
In fact, I'd say that even smoking is more harmful.
However, I do know that opening the door to censorship legislation opens a whole other can of worms that may prevent you from seeing, saying or even doing other things which you take for granted now - and that you may actually WANT to.
And that to me is far more harmful than anything people like Erroll Naidoo spend most of every day bitching about.