I used to be super uptight when my friends would swear around my kids.  But I've realized, they're just words and since my wife and I don't curse in front of them they're not going to repeat (or haven't yet) words they aren't familiar with.  If my buddy Matt comes over and uses the word, "masticate", my kids aren't going to repeat it...even if it's used in the correct context.

That being said, I don't judge.  If your kids do swear, hopefully they're as funny as these kids....

Not Safe For Work.