>>108783399Gorean setting is as someone else mentioned although the women who are "raped" actually are proud to be slaves and enjoy sex with their masters.
Fencer of Minerva involves such a similar setting in that it features an exiled prince who runs into his childhood friend who has been enslaved by nomads and he acquires ownership of her. It results in her becoming proud to be his slave, sex partner, and lover. The nomads are not depicted as evil and they become valuable allies of the exiled prince and the leader who enslaved the female friend respects her greatly.
My reference in owning Lumi would mean she would be proud to be my slave. She would be a happy slave and even have rank above "free men" as well since she is my property.
Sword and planet is basically like sword and sorcery but can involve traveling to moons and other planets kind of like in a sci-fi. Final Fantasy IV was kind of like a sword and planet to a limited extent in that it leads to traveling to the moon to defeat an awakened evil. Warcraft 2 is kind of like that cause the orcs are aliens from another planet and you even travel to their homeworld in the expansion. It often conjures up the image of a big rough-and-tough barbarian hero using a giant sword to defeat a 1950s sci-fi robot.