My man, the best visual novels are text heavy. Think FS/N, Grisaia, Muv-Luv Alternative.
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Could we let people have fetishes? I mean, you're not forced to play the games, and there is quite a market. Especially for NTR.
This is how to kill your game. Honestly.
If you are going to add stuff like that, you really need to be upfront. You also need to make sure that people know if it's AVOIDABLE or not.
Just making a Harem (+ incest, usually how it goes) game, and then add unavoidable NTR or rape (I'd count it separate, I think NTR requires willing involvement etc), you will tank any trust people have in you.
Now I don't know what you think about Guro, for instance, but if you were playing a game that did everything right, and then suddenly, one update, without any warning, your LI just gets ripped open and torn apart, full on gore style. Would you be happy with that development?
You can just exchange Guro for anything else, just something that you find disgusting, and there you have it.
It's not about not letting people have fetishes, it's that some fetishes are (for most people) absolutely disgusting, and people need to be able to avoid them.
Also, there has been a few cases were a dev has had a game that touted itself as a harem game, people gave them money and supported them, and then they just add NTR or something. I would feel cheated.