Excellent, I thought that arse was a primarily Scottish or British thing and qs unrecognisable anywhere else. Thats fab to know it is a far reaching word.
It is the same here though, it is very tame, you can fall on your arse and all manner of nice decriptive things that need that little punch.
YOu will have to remember the arse in future for your next epic call, not that you want one!