“With one long claw, he shredded through silk and lace, and my undergarment fell away in pieces.” Sex with a shape-shifting fairy who is sometimes part-wolf, part-bear is not everyone’s cup of tea. But many teenagers and young adults love reading about such things. Sarah J. Maas, a leading writer of “romantasy” fiction, has sold more than 75m novels. This horrifies those who think both witchcraft and fornication are detestable in the eyes of God. Which is why five of Ms Maas’s works—including “A Court of Thorns and Roses”, from which the quote above is taken—are among the most-banned books in American schools.