When I dedicate myself to read books, I always like to see which author it is about, and the topics that it handles, and that drives me to look for my writings to be more varied; not to dedicate myself to a single subject, for example: history, family, environment, society, biology, oceanography, the topics that gave me professional training and thus try that my readers also enjoy browsing the pages of the book. This time I have selected a topic of Human Biology, a bit Anatomical because of the way it is presented and described and at the same time picaresque, because not everyone dares to say the things that are looked at, observed, felt, because they are considered Taboos. It is nothing less than the Zone of balance of Man, without which he could not walk upright for lack of counterweight in the lining of his skeleton: Many call it Buttocks, another ass in its most popular form.