This article is from the Stand-up Comedy FAQ, by Steven Rosenthal and Steve Silberberg (firstname.lastname@example.org) with numerous contributions by others.
A. The short answer is to get up on stage and speak your passion. If you
cannot possibly get your point across without using four letter words, then
use them. If your personality is such that you use four letter words as a
matter of course, then use them. But using them gratuitously is a crutch
that should be avoided at all costs, especially if you have TV aspirations.
It's not always desirable to change your personality for the audience.
Speak your truth. You can say what you think an audience wants to hear, and
they may think you're funny, but you won't pioneer anything new unless you
use that one thing that makes you different, your own personality.
So if your passion is to tell people that you think date rape is funny, why
censor yourself? I personally do an awful lot of religion jokes. Many
people hate it, but those are the types of things I want to tell people. I
have no burning desire to tell people what I think the difference between
cats and dogs are.