Matriarchal theologies are many and varied.
Most Femdom regions that feature an afterlife believe that good male slaves will continue to serve women in paradise. Worthless slave men spend eternity in a Femdom Hell tormented by demonic dominatrices.
Some Gynarchic theologians teach that men have no souls. That paradise is so perfect that servants have no place.
A radical liberal sect asserted that after death the sexes became equal. Violent persecution forced these women to recant.
One woman’s cult is another’s church. Members of the Church of the Super Female believe slaves have immortal souls but that all men die and go do Hell. The church is popular among the most hardcore female sadists.
Ceremonial torment of men is the central event of church services. In this context it is believed that the sacrifice’s groans and whimpering are heard by the Divine Feminine Principle as prayers by the women inflicting the torment.
Thus in ordinary home life insuring that men suffer physically and emotionally is believed to a religious duty.
Surprisingly the slave men owned by church members live very long lives. Protracted and extended suffering is believed to be especially holy.