Actually, what most people don't know is that the limits of what you can say are dependent on the channel. You can say bitch, damn, and poontang, pussy, ect in commercials for channels like Comedy Central. Nick and Disney for example, who have audiences of 12 and under, usually have much more strict rules on the level of obcenity in commercials.
It also depends on the time, what country you are in, ect, but I've wrote enough.