I think it's fine if you want to lay down some rules for your own home, around family etc, but they are going to do it when not around you. Hence playing sports. I think for me being in my 30's and having kids, there is a time and a place for it. Cursing can be an expression, it is just a word. It depends on how you are using that word.
We aren't in the 50's anymore. Cursing is heard almost everywhere, have you heard music lately?
Saying "we won the f'in game!" is very different than calling the ref "an f'in blind mother f'in clown" Cursing just to curse is different than cursing AT someone.
I mean it's all over the news..."let's go brandon!"