There's lots of sharing in this game and its about your girls becoming incredibly slutty. What differs is how much control you get over it. Going pure vanilla here gates you behind a lot of fun stuff. This isn't a traditional NTR game. The women in the MC's life are emotionally loyal to him, they're just gradually becoming slutty and having sex with others because HE likes it. Its just a question of whether you're pimping them out, or letting them go out of control while you're a bit more submissive.
Either way the protagonist isn't a complete loser. He does beat the shit out of an asshole who deserves it and has some reasonably healthy boundaries in all this.