[Margaret Pilkington]

I can't answer that part of your question......personally I use an everyday word as an expletive sometimes(the word I use is Sugar).......I am pretty sure that no-one would find that offensive...whereas names for either male of female genitalia, when used as a form of verbal abuse.......well, it can't be seen as pleasant can it?

And, yes, I do appreciate that they are only words, but it is the way they are used, the tone, the inflection.
Maybe my views are those of an old fashioned era, but it was an era where courtesy and manners were something to aspire to.
It seems that courtesy and manners are a bit thin on the ground at present.