Offhand, here are my top three:
[1] The Wandering Hill (F/M) by Larry McMurtryThis features a young Englishwoman from a noble family severely whipping the naked buttocks of a Dutch biologist with a heavy switch, it's set in the American West during the 1830s and that wicked licking is actually erotic in nature, since they are lovers who are both aroused by the 'English vice.'
[2] Leaving Cheyenne (M/f) by Larry McMurtryThe heroine recounts being strapped in the nude with a razor strop by her father as a teenager, because she refused to have sex with her brother as a 'demonstration' of how to engage in intercourse.
[3] Waldo and Magic, Inc. (F/M) by Robert HeinleinIn order to obtain information from her victim, an elderly witch spanks a stubborn goblin (who retains his clothing, whatever goblins wear) across her lap with the sole of her shoe until he gives in. (This is from the "Magic, Inc." novella in the book.)
Although I'm not into M/M spanking, these two literary classics contain such scenes:
All Quiet on the Western Front by Erich Maria Remarque (Whip on naked buttocks)
A Canticle for Liebowitz by Walter Miller (Wooden ruler on naked buttocks)
--C.K.