You see, I get most of my swearing out on the forums.
My parents will never see my account on these forums, as I only use it on my own personal computer that they never use for any reason. Not to mention my history auto-deletes when I close out Firefox...
As for swearing in real life, I try to avoid it, usually because most of society is pretty sensitive about that type of thing, but if I'm hanging out with friends or talking with this one really cool stage manager I had for a show I did, I'll swear all I want. I digress, but this stage manager is awesome. He like, thoroughly enjoys swearing and dishes out the forget whenever it seems plausible. I love the guy, he's so entertaining to be around.
Oh, and a while ago (I'm not sure how) my parents got into my skype account and looked around at all my chats. When I asked them why they bothered to go into chat history, they said they "Opened it by accident" and that's as far as they got before it would be impossible to not justly accuse them of snooping. Anyway, I said some pretty bad stuff in some conversations...mostly with magick mage, but I didn't make the mistake of letting them find anything ever again.