Gor Series
A series of poorly written and highly misogynistic science fiction books written by John Norman. What started out as a bad John Carter knockoff quickly devolved into incel fantasies that push the idea that women can only be their true selves as sex slaves subservient to the will of men. They inspired the cultish Gorean subculture.
If you ever want to read a book that will make you lose hope for humanity, just read one of the books from the Gor Series.