For those who are in doubt about the NTR content, I will make an analogy.
1 Would you rather take the female character and lock her in a basement so she never cheats on you, and so you know she doesn't like you, she's forced there, if she had other options she would stay with you?
2 Or let this woman go free and know that she won't cheat on you because she likes you?
For me, games that don't have this option seem like option number 1, do you understand what I want to say?
It's much more pleasurable to know that this woman is free, but she won't cheat on you, because she's not a whore, and she likes you, option number 2.
And you can only see this in practice, if the "bad guys" try something with her, and you see if she will reject them.
Each character in my game may react differently, but you will receive tips about each woman's personality, and even before anything happens you will know if she is trustworthy, if you are paying attention to the tips.
In my game there are many ways to prevent your woman from being stolen, one of them is if she is in love with you, staying strong protecting her, and some will protect themselves and even if the player wants NTR to happen, with some of them it won't happen. , because the characters also make their choices, and with some of these characters, they themselves won't let that happen to them.
In most games that contain NTR (or at least the ones I've played) if you chose to go that route, you see a cheating scene, the woman is enjoying doing it with someone else or she gives in easily to another guy, in mine game won't be like that, on the contrary, as I said here, some will even die trying to defend themselves if you don't help them.
This is much more complex than summarizing being NTR.