Not everyone has the exact same interests you do. I would love to cater for all these different possibilities, but alas I am a simply one human being.
I still think it wouldn't be hard to include an option at the beginning of Scarlett's path, for example right before the first sex scene, where you tell her that you're not interested. The same in Evelyn's, when the MC says that he forgives her, we could be given the option of not doing it and ending her route. It's something easy that can help your game win over players who aren't comfortable with those routes (and many of them think that closing a path is not the same as not starting it).
And in the Bella route, it wouldn't hurt to be able to avoid the sexual content scenes: now that I have to repeat them, I'd rather be able to say no since I'm not interested in her.
EDIT: in my opinion Evelyn's route is fine until you find out she's a slut. Certainly in my opinion the option of rejecting her is missing: If you get to this point, you have to start a relationship with her no matter what, even if you later have the opportunity to not continue her route, the truth is that either MC has been a coward and he hasn't dared to tell to her face that he doesn't want to know anything about her, or really the MC continues with her even though we don't see it during the game. I don't find either option appealing.