Here's a published page from Alan Moore and Brian Bolland's Batman: The Killing Joke which I'm sure we've all seen before:
(And yes, that's from the original - I'm not breaking the spine of my Deluxe Edition copy for a single page)
Over at Brian Bolland's blog, he posted the original version of that page:
which I'd never heard of, let alone seen so I figured I'd share it.
Presumably DC Editors were happier with blood stained buttocks than they were with bare breasts in a Batman book.
"breasts" and "Batman" in the same sentence - I dread to think who's going to find this blog with those search terms.