When you add more routes, more resource time is required and unless you have a developer committed to non overlapping routes, it can get messy. Some people always like to think it is as simple as just adding more routes, but time and the actual benefit need to be weighed. I notice in some games paths bleed into one another to save this time and that can be off putting for some if it is something they do not like. For instance putting someone in constant positions leading up to NTR to keep asking the question do they want to go down that route.
If the routes are 100% separated, then it is not an issue. For instance a fictitious example. Dave is a bully and wants to bang your wife. Leading up to the NTR path to save resources, you are subjected to watching him grope your wife as you try to stop him or don't, constantly around you, taunting you etc. then it comes to a point where he is about to aggressively take your wife and you are at the door and then it asks do you want to stop this or some other mechanism or as the game starts you selected no NTR and you automatically stop it.
Now if the paths are truly divided first day Dave gropes your wife or taunts you, then you smash him in the face and he runs off like a bitch, then you have completely new scenes to fill in all the ones you would of watched him leading up to NTRing you. Then on the NTR path you have all that build up as stated above. It is a matter of how the Developer approaches. If two routes are separated, it is absolutely fine. Two merged routes bleeding into one another may be off putting for some as they have to watch the build up or hints of NTR just to save time.
So if the Dev has time and dedication, then by all means make two routes. But option two as I stated may lead to some opting out as they don't want to be constantly reminded of hints of NTR even if it never happens. But then the slow down to content coming out becomes a factor, if you update one route more than another, that can lead to rivalries possibly among consumers as they lash out in frustration and the length their route takes to bear fruit.
Not saying this game should or should not have it, have not played it yet. Just stating an observation.