>>98645309I'm fairly sure the ubiquitous spanking has a lot to do with how pornography was difficult to obtain, it's like a little reference to fetishist sexual material like Bettie Page's stuff in otherwise "respectable" publications. Like sneaking in sex jokes in kids' cartoons.
Spanking was probably popular because it's easy to disguise as well-meaning so it'll pass the censorship; that girl just needs to be corrected, so she'll behave from now on! It's for her own good!
Like, they couldn't put in direct sex or erection jokes, but they put in spanking every chance they got.