Yeah, i don't like that either. That's is kind of gay. Though i don't mind a bit of Femdom..
@BeWilder
I would say, even if i made this distinctive explanation, the truth is, for "normal" Folks it won't make any difference anyway, because if it comes down NTR, Cuckoldry, Swinging/Sharing, or generally cheating, for them everything is the same. They still have an different Partner for Sex, while they have already an Relationship, that's why it doesn't change that much for them. But for People who enjoy this Genre's, there is an key difference. In Cuckoldry(atleast if it isn't bound to NTR), Swinging/Sharing i don't feel the emptiness which comes with NTR. Because in this Aspects clearly it shows that the Woman actually loves her Husband/Boyfriend. It's simply an Fetish for them which (normally) both of them enjoy(if not the Boyfriend would already left. Cheating(Tag) is a bit more hardcore, because while she still might have sex with different man behind the back of his Boyfriend/Husband, she still seems to love him and don't want to become the Sexual Activitys to become more. But Netorare is absolute, it's aimed to the full humilation of the boyfriend/husband and have some way depressive ending.(There are some exceptions though).
So straight to my Point:
For People who aren't interested in these Genre's even with this difference it won't make any kind of difference. If you want and believen in have only sex with your one partner, it doesn't matter what the reason is for someone to fuck another person. But for People who enjoy let's say the more open sexuality - there is an difference in which way the Story is presented. Did someone take it away from me, or do i want to share and enjoy the view, and let her have fun.