Vampire and wizard fans are apparently ready for characters who shed their robes and show a little more skin.

Publishers and authors say they are seeing a spurt in sales of books that fit into the young-adult genre in their length and emotional intensity, but feature slightly older characters and significantly more sex, explicitly detailed.

They’ve labeled this category “new adult” — which some winkingly describe as Harry Potter meets “50 Shades of Grey” — and say it is aimed at 18-to-25-year-olds, the age group right above young adult.

Image In the growing realm of “new-adult” novels, desire is no longer nascent or cloaked in symbolism. Credit... Tony Cenicola/The New York Times

The goal is to retain young readers who have loyally worked their way through series like Harry Potter, “The Hunger Games” and “Twilight,” all of which tread lightly, or not at all, when it comes to sexual encounters. In the “Twilight” books, for instance, readers are kept out of the bedroom when Bella and Edward, the endlessly yearning lead characters, finally consummate their relationship.