You can avoid some content by making the right decisions. But this is not a "pick your kink from a menu" kind of novel but one in which sexual content and story are intertwined. You cannot simply avoid things as the sexual elements are story related. For example, if you pick choices in which your main character acts weak, you are going to get punished. That is how it works. You yourself can avoid getting punished by picking "right" choices, but that can mean someone else is getting punished.
So... long story short, sexual content is absolutely intertwined with story. Cannot be turned on and off.
My advice. PLAY THE GAME, you will absolutely love it. But keep in mind, this is not your standard novel you can find in f95, made to please an audience with fan service. You have to approach this novel as what it is: a REAL ADULT novel with real choices. Real in the sense that it is not like "you picked a but b was the right choice" but in the sense that they lead to very different outcomes, neither good or bad, simply different.