Hope you got in on the Naked girls iPhone App while you had the chance. Apple just removed it from the US store.
What's the point of having app ratings and parental controls when there aren't going to be any adult-only apps at the top of the ratings pile? Who knows. But it's not like you can't just open up the Safari app and see all these photos elsewhere on the internet.
Hit the gallery for a taste of what you missed. [iTunes (in case you wanted to verify for yourself, or if you're in another country)]
Update: He may have taken it down voluntarily because of traffic overload? [Techcrunch]