Cartoon Brew has scans of a Look Magazine article from January 17, 1939 on how the Hays Code "did its thing" with cartoons.
I laughed out loud when I read this bit: "Robert Taylor may kiss Garbo in a feature picture, but it isn't considered nice for Porky Pig to kiss Petunia Pig in an animated cartoon. Censors prefer romance of the hand holding type."
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