Why can't Johnny stop reading?

I'm a firm believer in the idea that children should be encouraged to read as much as possible, but they probably shouldn't be reading stuff like this:

A spokesman for the Sainsbury's grocery chain has apologized after children visiting a Haverhill, England, store were given sexually explicit books.

The spokesman said the book, entitled "How to Change the World for a Fiver," was mistakenly given to fourth graders visiting the store from Burton End primary school, The Daily Mail reported Thursday.

The book included the suggestion that readers save water by "bathing with a friend" and contained 12 sexually explicit illustrations.

The books apparently "mentioned the company's positive environmental activities." Sounds like a pretty fun place to work.

Anyway, you'd think someone at the store would've read something with subject matter that...interesting.