Hiya, I bought the book online along with some other books a while ago - sorry can't remember where - i would try ebay or google it and see. It will give you some ideas - it has little cartoon people doing stuff in various positions, including on a spacehopper! It is for kids though and is ideal for the 5-7 age group. Better than another book I bought that was apparantly for that age, but was a bit to graphic and serious for my taste - It is best to be as honest as possible without giving too much info.
I am now at the point where I feel I should cover up in front of the boys, so i try to be discrete, but they still come barging in while I am trying to get dressed, but they don't seem to bother and are not shy about their own bodies either!