Agreed, I am very thankful to that player for letting me know about it. Honestly, I don't like NTR either, haha.
If you don't like it, simply don't add it. And the reason on this is simple: If you add a fetisch, that is not to your liking, you won't probably put your whole heart into this content. In this case, it will feel rushed and incomplete to the fans of the fetish and won't satisfy them. It will result in them demanding more and better content involving this fetish, which most often leads to the dev being burnt out or hating his/her own game and abandoning it. Or they will review bomb the game with a ton of negativ reviews, which discourages the dev, resulting, again, in abandonment. And this goes basically for all fetishes out there, not just netorare/sharing/swinging.