So if you think it through starting with the premises that women now have very strong sex drives and a lot of social power compared to men, the conclusion is that at least the most powerful women might try to form harems. I confess that the whole "NTR" thing confuses me a bit since it's really just being unfaithful in a committed relationship, which is something that happens in the real world pretty often - just a fact of life. I scratch my head when I see it used as a tag or kink(?) since I don't understand why that's needed. Maybe some adult game fans are very turned on or turned off by it? I don't know. In any case, the MC is desperately trying to find a situation that provides the most happiness and personal safety he can get, considering his status in this confusing and dangerous climate. And he's at the mercy of several women at least for the time being. So, he will "cheat" on his girlfriend, etc, because he doesn't necessarily always have the option not to. But I don't treat it as, or consider it, a sexual kink or fetish. Many/most women post-Change don't feel likea monogamous relationship is in their best interests, so they don't commit to one. And the MC does what he must to survive.
Does that make sense? Also, if you can explain what I (clearly) don't understand about netorare, I'd appreciate it.