I too was taken aback by some of the stuff in Puss In Boots like the "It wasn't over easy" part. My face probably looked like that cat who said, "oooooh".
When that scene ended I looked at my daughter (who is 6) and she was just chomping on her popcorn oblivious. A few days later I was flipping by old school Bugs Bunny cartoons and laughed like I never had before. They were so dirty and I didn't even know it.
When they made those cartoon shorts, they wanted to entertain the kids, but also please the adults who to had to take their kids to the movie theaters to watch the newsreels. In short, it's always been there and will always be there.
I agree with Jeff Berndt that parents can control what their kids what when they are younger and educate them to what is and what isn't appropriate as they get older and further from parent's control.