Hi, just my 5 cents as a player...
I like romance and faithful games, or where I can be faithful.
NTR is for me a very broad description of feeling uneasy and made jealous of other people intimacy. It is not all about stealing or even having a relationship.
Many say because it is Girl on Girl it is not NTR for them, I would still feel uneasy.
A LI making out with other girls without my knowledge or else is for me already NTR. It makes me feel uneasy, also if there is no relationship. If the games makes it look like there is something growing and then the character fools around with someone else...ntr for me, I don't care if male or female...
Examples:
I saw an example mentioned, Maya and Josy in Badik, I have let them gone, I felt more like a third wheel and pretty bad in this situation, same bad feelings like ntr, they loved each other much longer and I have not seen the big romance between all three.
Another one, don't know the game name, the sister is hitting on the girlfriend of MC, that gets me also furious, could bitchslap her. also no clear NTR label on the game.
One I just read about, mother and a teacher getting at it, making out without the MC, MC had already sex and intimacy with the mother. He just walks in on them and suddenly he can join. I would feel the same third wheel, I already think then, ok, if I would have not gone there, would they keep fucking and starting something?
Or even the one where the girlfriend is fucked by her mother while being away from the MC etc.. that's NTR/cheating... but many don't care because girl on girl..
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I would always appreciated a game which is clear with the relationships. If you are a guy with no commitments to anybody and everybody is clear they can fool around with whoever, then I am fine if partners have others. But I have to say I avoid obvious whores or slut characters anyway.
Best would be polyamory, this is for me the best of 2 worlds, Harem and Romance. But I guess that's too boring and missing all the drama...
I have to say I played my first NTR game 2 days ago, which I actually find ok. Why? Because I could tell my wife to fuck off after she fucked my boss, so I can keep my job. How pathetic do you have to be to find this great and stay with her and even work for this guy? I found it satisfying to be able to react like a, no offense, normal human male. Ok, after that MC makes suicide because he is still pathetic, but I think this is normal in those games.
If something like this happens, like above examples, give the MC the possibility to break up and so on... otherwise he will stay always cuck and I don't believe many like this...
Regards