Pffft. I talk to students about protecting themselves during sex, I cuss around some kids, hell I even bully a kid or two. You HAVE to know what kids you can say certain things around. I know there are some kids ,that w/ my personality, I need to just walk past them in the hallway. I know some kids that'll make a dumb life decision, that I can take in an empty classroom, raise my voice, and go off on about how much of an idiot they're being. Some kids will walk down the hallway and shoulder bump me and laugh. I know I can throw a paper ball at that kid and he not go call mommy. The kid that just told on another student for cussing, I know to filter my language around him.
You can't say what you want to everyone, but maybe you shouldn't be able to.