I've never seen the Vagina Monologues and have no plan to. But you seem to think there's something inherently wrong with the word itself and/or explaining what it is to a child.
Better you should explain it than one of his/her school chums.
I don't think that there's anything wrong with the word.I simply choose not to use it with the realization that this site can be read by children of any age and I try to respect their presence by tempering my words. It's not my business to "educate" them on such matters.
I am not a teetotaller - I love theatre and appreciate that alot of entertainment with "adult" content. This particular play is rife with adult content (and just plain pointless perversion... but I digress) yet it is blanket-marketed to the public by the university. I don't think that I stand alone in my condemnation of such inconsideration. I totally agree with you that it is my (i.e. the family's) responsibilty to educate their child(ren) about such matters - that's what outrages me about the production (and its non-discriminating advertising).