If there is nudity in the book then its going to make me less likely to want the book in my collection. Such a book would be one I could not use to try and bring friends into the hobby, it would be one I would be far less likely I can put it on my shelf where my kids will read it, and, if I did have such a book, it would be nearly certain to make my wife start asking me why I have all these books in the first place. A family friendly hobby should have family friendly art.