The synopsis above has one serious error that makes it quite clear whoever wrote it has not read much if any of the series. "Slave girls" are not one of the "three different kinds of beings that are labeled beasts". The "three[]kinds of beings" on the planet Gor are: Humans (male and female), the giant insect like "Priest Kings", and the titular "Beasts" also more properly referred to as Kurii, or just Kur for short. Humans are played as pawns by both the Priest Kings and Kur in their struggle for power over Gor. The struggle of Gor has remained in stalemate for millennia; Though if ever the balance tipped in favor or the Kur dire consequences for Earth would ensue. For they truly are best described as "Beasts" of Gor.
Now....., Having said all that anyone who has read the series thus far will not be shocked to learn that the sparse story is interrupted with pages of demagoguery on the "proper" and "natural" relationships and roles of men and women. If you've read the series this far and are committed to finishing the series go ahead and read this book. Otherwise, don't be in a hurry to read this book or any of the books that follow it. ( )

So, this science fiction series takes place in a world much like ours--climate, vegetation, most of the animals--but the citizens are much less technologically advanced and still live in the age of the sword. Women must know their place, frequently serving at the feet of men. Oh, and there are other advanced species warring over ownership of this world called Gor. Well, let's just say I enjoyed this much more as a teenager. Way too much male domination for me this time around. Also, now that I re-read this, I remember this as one of my least favorite in the series. But the series as a whole, still has a fond place in my memories. Perhaps I will just leave them contentedly there. ( )