I found highly enjoyable moments in In Praise of Profanity, especially the chapter on bathroom graffiti: some folks are patient enough to write proper quatrains that entertain and rhyme! The author also dazzles when he shows how profanity can add movement and intensity to dialog in real life and films.
But to get there, you will have to traverse the first couple of chapters, in which I think he tries to explain that there is no proper definition of profanity and we should not categorize words to begin with, and all words have the same rights. Hell no! As he himself points out, most adults who swear refrain in front of children, for instance, so clearly something interesting is going on. I would have liked to see more illustrations and fear sweeping judgments that all words are equal.