Maybe I'm just asking for it, but I just did some searches for these things, and only found two out of the three. Both of them took a fair bit of searching to find, as well. I suppose I might be able to stumble across them by chance but I think it would be unlikely. The one I didn't find would I think be illegal under Florida law, and "illegal" is a different kettle of fish to "inappropriate".

Thank you for your perspective :-). I agree that I'd rather do the teaching myself, but I think the reality is in this day and age is that the Internet will probably be first, especially on some of the more 'unusual' expressions of human sexuality. This is something I think that us older folk are going to be unprepared for, at my son's age I'd never actually touched a computer, let alone been able to surf an Internet! Part of the strategy of course is to set the tone in the household to something appropriate, my son is growing up in a sex-positive environment where sex is not seen as something taboo or undesirable, so with any luck when he eventually does stumble across some of those things that Andreas mentioned, more likely on the wider internet than on Wikipedia, he can process them appropriately.

I guess what I'm getting at, is that I don't view some difficult to find stuff in an obscure corner of Commons as anywhere near as big a worry as some easily accessible Internet pornography which portrays some people purely as sexual objects for the gratification of other people. Even a 100% perfect filter on Wikimedia projects isn't going to fix that.