The above discussion is why I often wish this site would do away with NTR as a tag and a genre. Make people either choose from among the set of English words describing non-monogamous or extra-whatever relationships and let people who want to indicate the presence of
actual NTR use the correct Japanese word(s) to describe the specific type(s) found in the game.
For too many people NTR has just become a synonym for cheating. There's even a vocal minority who view
any sex other than with the player character as NTR, which is a ludicrous deformation of the concept.
I guess that an NTR purist would answer: if the NTR is avoidable, it's not NTR.
I'd be curious to know how many NTR fans agree with you on that. To me you're voluntarily giving up half of your potential fan base if the NTR is unavoidable.
A true NTR enthusiast would, if it's more like a story or a kinetic novel, obviously prefer that it not be avoidable, otherwise what would be the point? I think the subset of potential players that enthusiastically enjoys the element of risk — whether it's to keep your designated lust object for yourself or to let others have their way with them, and just what the right choices to make either happen are (basically The Tyrant model) — is largely a different set of people.
I say this in part because it's reflected in the games themselves. It's very rare to see a game go all in on the potential for NTR
and the possibility of avoiding it with equal enthusiasm; usually, it's clear by the intensity or logic of the story and the quantity of the sexual content that the dev has a strong preference for one or the other, which always makes me think that it would've been better to just make an NTR game even though it limits the potential audience.
An example of what I mean would be something like Because I Love Her. The NTR path (and there
is actual netorare in this game, rather than just cheating/open relationship/swinging/whatever) is clearly the dev's preferred path, even though an alternative path exists. To me, trying to satisfy both camps is the sort of thing that unduly delays and even stops games, because there's an entire half of the game to fill with story and sexual content when it's obvious the dev's heart isn't in it.