I agree. I like many genres, fetishes, paraphilias. But there is something about cheating and hard NTR that thrills me differently and more intensely than most.
In my opinion a woman transparently accepting her sexual urges is already, because of sociohistorical prejudices and mores, exciting. They are supposed to be motherly, reserved, pure, and although society has evolved with regards this restricted and opressive perspective, it is still pervasive I think.
Then if that woman is your wife, societal norms expects that she loves you, be caring, nice, loyal, responsible, family oriented, etc. If she becomes a hotwife/slutwife, dominated by her sexual desires and impulses, without a care for you or anything, that represents a transgression of multiple taboos, and that makes it hot. Then if you add some femdom, teasing, cheating, breeding, humilliation, sexual privations to the husband, etc... All this mischief and broken taboos definitely activates something primitive and arousing, but not for everyone of course (otherwise we would not have so many annoying negative comments and reactions by other members in every NTR game; btw this in itself being evidence of how illegitimate the genre is perceived to be).
It is as well important to remember the difference between fantasy and reality. I do not think I would enjoy hardcore NTR or cheating in real life at all, but in a fictional story, with fictional characters, is safe to indulge.
Sorry for the companion rambling to your post xD.