I don't really swear. I do use 'damn' very liberally. Not to other people, but when I drop something or stub my toe... stuff like that. I also say crap quite a bit, but that doesn't really count.
Swearing is what you use when you want to sound important in front of other people. When I stand in the lunch line, the morons in front of me use some form of the f-bomb about every two words, with sprinklings of other curses. Makes me frown--pointless swearing makes people look arrogant and unintelligent.