From what the plans say for the other characters very few are going to be NTR, it's just that popular that there needed to be a couple of them. The next release
I'm going to be adding something so that you can completely disable it, so if there are ONLY NTR routes the story wont appear, and if there is a route that doesn't have it its the only one that will show up (so you can still play the story, the NTR options will just be completely gone). I know some people REALLY hate it.