In high school some friends and I discovered what you might call an advanced sex ed book, stashed in the school library. It was thin and softcover, like a workbook, and had lots of graphic ink-wash illustrations of naked women and sexual positions. We spent a lunch period giggling over it and then re-hid it inside a larger book we figured no one would ever open, a Native American history book. I returned the book to its hiding place and then hightailed it out of there, shaky and relieved.