It's kind of harsh, but I would tell one who makes that argument here that there are plenty of other forums to go to. Maybe they'll let you cuss and swear all over them, haha. Just as one is free to swear, we're free to tell them to leave.
I just know, I absolutely know, that a vast majority of our member base is quite young. And even more people that stop by this website that don't join are the same. I was even hit up by a mother of two on our Google + page asking if I could take down the "scantily clad" woman in the blue theme, as she thought it was too revealing for her kids.
We try to be appealing to all, and excessive language just isn't appealing to all.