maybe because this is the first time female-produced porn has been so massive, men don't know how to react to it

Exactly! I think that's part of the article's point: labeling it implies it isn't "real" porn but rather some kind of feeble attempt at porn by women who don't know what real porn is.

I don't get the implication that only people who've had kids read these kind of books

Me neither. Maybe Todd Akin can explain it, he seems to know a lot about women, heh heh heh...