As long as there have been donkeys, there has been the secondary name for those humble beasts of burden...ass. Whether it be in the Bible, the Canterbury Tales, Shakespeare (most notably A Midsummer Night's Dream), or any other old english text, you will find this word in common, unoffensive use. 

Then there's that other word...ass. Many uses of this relatively mild insult abound. An extremely versatile word, it can mean a person being rather smug, rather donkeylike, or it can simply be used as a derogatory term for a person's backside. Many have used this word, and many still do. As long as both meanings of the originally harmless word have been around (and it seems humans have used the latter more), we have been searching for a way to know how to correctly put this word into context without being offensive, preferrably a book, or guide. 

This is not that book. It abounds with not-so-subtle humor, plays on words, and an extremely incorrect use of ass (as used to describe a donkey). If you are looking for the above-mentioned guide or book, do not read this book. IF, however, you seek a good chuckle that turns to side-splitting chortles, you may have come to the right place.