Considerations about your list, which is very good and left me scratching my head in many cases
1 - Lesbian content, at least for me, is not NTR, ahh but they are having fun without your authorization, you as MC also do this with other women, that is, everyone has the right, of course as long as they don't cheat on you with another man, if so Everything is always calm between your LIs. An example from what I understand in
Desert Stalker where you said that the wife and daughter have sex( if it's between them ok it's not NTR, if it's with another guy then I think it's NTR) and that your wife and youngest daughter( as I don't speak English well here, in one translator a younger son appeared and in another a younger daughter) they play with the maid, for me everything is normal with that, because it's like I said, as MC you have fun so they can have fun also have fun with each other.
2 - As for the
Bare Witness game, I don't think it's that soft, because you have sex with LI, that is, there's already something between you and she then starts having sex with other men, I think that's very NTR, even if it's not for humiliate, that's betrayal for doing that to you - This made me really rethink playing this game, because I didn't like this scene at all
3 - As for
A Mother's Love, there are two things, the first is the real NTR which is if you don't pay attention to your girlfriend she cheats on you because she sees something in the teacher that you are not giving to her. Now as for Nicole, whether or not you have sex with your husband will never be NTR for me, because they are married and even if she has something for you, from what you can see in the game she hasn't given up on her marriage, of course
. But as long as she doesn't separate and assume the relationship with you, she's still his wife.
4 - In the game
Infinity: Love or Lust it depends on how you are, as this also applies to real life if you are a loving guy who makes the Woman feel good she doesn't need to cheat on you, but if you are a spoiled child who doesn't know how to treat a woman then she will cheat on you.
5 - In the game
The AssistantI spoke to the DEV about this game and he said it wasn't for me, because according to him there are strong scenes in relation to your family, where you see guys invading your house or your friends doing things against you. the women in your house in front of you without letting you react against it, in other words strong scenes that for me were something heavy based on what he told me, but based on what you said here it seems very different.
6 - As for
Come Home, the woman who proposes to you to participate in the gangbang, she tells you from the beginning that she doesn't want a relationship, but just a partner for sex, because she's not just one, but many, because she likes whether it's like that or not depends on whether you want it or not, and in this game everything is easily excluded, because either you block the character or say you don't want to share and depending on the person they accept and you continue or you break up with them because doesn't want to share it with other people.
Otherwise, honestly, I play few games with avoidable content, because many of these avoidable content make the story a little different from what is normal, it seems like you are doing something that shouldn't exist because the characters want that to happen.