Swearing is like farting. If you can slip one by without offending anyone, by all means let'r rip. If you are on a crowded airplane and the stench would be horrific, try to hold it in. If you are with the boys making some deer sausage, let the farts fly, its part of the fun.
I have found you can tell anyone about anything you want if you are pleasant, and have a big smile on your face. I had a boss convince me of all sorts of tasks I should be happy to do, and even though they all sucked I was happy to do them by the way he asked me.
I plan on swearing a bunch tomorrow while watching the bison game, good or bad its coming.