Kodama has a few other non-NTRs. There's Renai Manga, for example, which is quite nice and not anything to do with cheating. And a bunch of oneshots don't either, including most (all?) of the Afterglow Noise collection. It's really mostly Netsuzou Trap and a few other oneshots, as well as the overall more dark nature of her stories (when they're not mostly just about big boobs) that make people feel like everything is.
Heh, Renai Manga is so cute, I love that one.
I think a lot of that view comes from the fact that Netsuzou Trap is the longest thing Naoko has done, as was as being the only thing licensed in English from her until the last year or so.