I guess for its original time, this was a thought provoking book that pushed at the Western English-speaking intellectual's borders. Some reviewers complain about its light emphasis on hard scientific proof, and its dependence on a more socialogical/psychological explanation for why the Naked Ape became what it is. My rating is from the view point nearly 50-years and many scientific developments later.
Well give him a break! The "hard evidence" in both the early 1960's and by 1987 is only a tiny fraction of what we now know, theorize, or hypothesize in the early 21st century. If this was the first shot of evolutionary anthropology across the non-scientists' bow, then just bite your tongue as you examine the American-biased "proof" Mr. Morris used to substantiate his enlightened 1950's view of male-female roles and why we developed the way we did to reach the pinnacle of the Earth's biological pyramid.
(Now, let me pull my tongue out of my cheekbones.)