Well, this may not be the best way to get kids to learn math. A Thai textbook publisher named MuangThaiBook has come under heavy criticism for sourcing a photo of a Japanese adult video actor on one of its book covers.

The title of the book is Basic Mathematics, and at the bottom is a picture of Mana Aoki, an adult video actor. The photo is apparently from the adult movie Costume Play Working Girl, so clearly somebody didn't do their research.

The publishing company printed and disturbed 3,000 copies of this book with the suggestive actress on the cover before catching their error. The company has reportedly removed her picture in the newer versions of the book.

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