In school, many textbooks were issued from the library. Biology books are no exception. Once from the library, someone had studied them before me.
Anatomy of man. Paragraph "Digestion in the mouth". My mother sits next to me and looks at me. And notices in the corner of the page a sexual penis drawn by the previous owner of the textbook.
Mother: This is what?
I: I’m more interested in what it does in such a paragraph...