I've been reading this, but I've also been reading that authors of certain controversial works were women (when in reality their sex was undisclosed, or they were male) and that the majority of ero-mangaka are women (when they're almost certainly men).
At some point, I started to suspect that statements like these were young men trying to legitimize/justify their interests through juxtaposing them with women ("sex sells", for the record, refers to the fact that you can make anything look more appealing by putting a woman next to it, regardless of how she's dressed). Either that, or young men trying to "vulgarize" women in their own minds-- trying to bring their image of them down to earth, or closer to them.
I'm not arguing that women are incapable of having perverted tendencies-- there are known surveys that indicate, for example, women-- more than men-- fantasize about getting raped (though I think a "rape fantasy" is an abstraction of wanting free sex that one isn't accountable for, since you can't want rape by definition), but I'm genuinely unsure if what you're claiming is the case.
On the other hand, I think NTR and cuckoldry (fictional, anyways) is generally more popular in East Asia than elsewhere.