Why not? The premise makes more sense than most other back fuck games, allows for a healthier romance between multiple love interests, and portrays all characters as having their own goals and lives outside of just sex. Not only are you the only guy, and therefore get to monopolize all the women, but the women are cool with each other, and get better at sex. You have the freedom to choose to dominate or be dominated, or even reverse it mid-fight, and there's no stupid contrived story about why you need to begrudgingly fuck through an army of different girls to save the world or something.