Bloodworld

A science fiction novel of a world where sadists are allowed to fulfill their urges, & where suffering & torture are essential to the maintenance of civilization, a world dedicated to pain & those who enjoy it. Also released as Bloodworld (1969). A "sane" ruling class of men on a colonized planet torture the underclass women of their world. This is seen as normal until one of the men develops feelings for one of the subjugated.