Very interesting thread and many great comments. I'd like to add one different perspective that hasn't been mentioned.
Unfortunately, we now live in a different time compared to that wonderful time in the 60's when Shel Silverstein did his best work. Remember "Lizzie Borden" and the Pot song done by the Chad Mitchell Trio. They were hilarious and widely acceptable. Somehow, I just don't think they would fly today. What was acceptable then MAY not be acceptable now.
One of the societal outgrowths of the 60's and 70's was that we all learned that we had a right to protest. And protest we've done - about nearly everthing.
I like "Our House" and other naughty songs, but I, as a member of our currently PC society, can understand why others may be offended.
To Joe: I fully support your freedom, as a performing artist, to do what you want to do.