I was brought up by old fashioned (even then) parents, we didn't say poo let alone Sh... (see, I still can't say it). Your backside was your bottom, never ever bum.
I remember reprimanding DS1 for referring to his bum when he was in (school) nursery and his response was "the teachers say bum". How standards have slipped!
Anyway it was inset day here yesterday and my parents kindly had DCs. DS1 is now 11 and when I went to collect them Dad told me DS1 had been in a lot of trouble for using bad language in front of mum. Dad's opinion is that there's a time and a place and that DS1 needs to learn that in front of his grandmother is not appropriate. Which I agree with.
But, the "language" involved was the Beans Beans good for your heart...rhyme. I did well not to laugh when I heard. Was I wrong or is my Dad?