in four volumes, by Gene Wolfe. Sci-Fi/Fantasy.
like Heinlein, Wolfe has some free-thinking ideas about gender identity and flexibility. Wolfe at his absolute best, Book of the New Sun, beginning with Shadow of the Torturer, is a massive alternate universe, in epic style. one of the few works i ever read twice, and i'm just itching to read it again. totally original. awesome, awesome writing.