I'm actually glad to read this thread, as I agree with most of the replies ("Words are words"). I do swear, probably more than I should, and my kids will use some of those words. . .although they are more likely to tell me that I shouldn't say XYZ. We also talk about choosing your words for your audience, which is about more than swearing. I did try to modify my language at first after having children (i.e. using "poop" instead of the alternative), until our neighbor made a comment about one of her sons saying "poop" and how horrible that was (he probably heard it from one of my children
). Which really brought home the point that a "bad" word simply depends on the audience.
Funny story - the first time one of my children swore. . . We were at the drugstore and I had pulled the kids in our wagon. I'd asked an employeee for help finding something, and was hauling the wagon after me but not really paying attention to my children (I think my twins were about 2 1/2 at the time). My son stood up in the wagon and yelled "SHIT" at the top of his lungs. He'd obviously already internalized that these types of words have high attention-getting value. I actually found it more funny than embarrassing (and the employee was a college-age guy, who probably didn't even realize that 2 year olds shouldn't say that word).