Check out an interview with Simpsons producer Mark Reiss:
Nowadays tolerance dominates the society and it is getting harder to make jokes without insulting anybody. Do you think that society limits creativity and where is the difference between humor and insult?
Luckily, people know what to expect from The Simpsons, and we can be as irreverent as we ever have. I have seen, though, as a public speaker, that audiences are much more sensitive than they used to be. You can’t joke about sex, politics, religion or death any more – you can’t even mention them! It is tough for a comedian when the boundaries of comedy are now set by people with no sense of humor whatsoever.