Now, I want to take the bull on its horns because I saw that there were many that commented about this and because I received more facepalms on my post related to this subject than I received during exams, I will talk about optional NTR.
First of all, it is optional. It won't be with all the characters but with a few.
Why did I go on this path!? First of all, is about giving life to the world, without falling into a kinetic way of seeing things.
In the optional NTR we can talk about someone that is being led on this path by the mc or a side character that has this desire from the start. The world is a big place.
I am trying to bring life to characters through diversifying and somehow creating a hint of free will.
Somehow it would be strange, that in a world where people are massacred, gods interfere with the mortal world and some people are on 'Alabama mode', the limit would be set on optional sharing/cheating. As if in the world I am trying to create, warlords stand aside and say 'Today we kill women and children but gods forbid if I will cheat on my wife.'
Leaving jokes aside, I think we should enjoy the freedom of choice and start creating our own world as we see fit. Not inherit it.