How about a system is set up so that you get credit for every post. With this credit you can purchase a swear word. The F*** word would be the most expensive but something like bloody hell could be earned in just a few posts. This way the amount of swearing would be limited. Best of both worlds?
Bungle: I think that the C word is a lot more offensive then the F word. The F word doesn't get you stabbed.
Unless you use it as a verb in a sentence, while also mentioning the mother of the very big, very scary bloke you're talking to.