I don't think I knew what a swear was until 5th grade. Then I cried in 6th 'cause some guy called me a stupid-ass or something because I was trying to get something out of my locker, which happened to be on top of his.
First time I said fuck was when I either 12 or 13. I got dared a chocolate for saying it :D *was, once upon a time, incredibly innocent* I only started using it regularly, uh, this year.