"and the magical ring (on her finger) that tingles whenever a fertile man is near"

Wait, WHAT? What kind of bullshit is this? I mean, I knew the series descended into crap (I read the first one, it was pretty good, then I read some AB and the heard what happened in both and stopped there), but...what? I mean, just...no! No! You don't need a ring that does that! Because MOST men are fertile! Unless I totally missed where she turned the world into a place where that's not true, why would anyone, even someone trying to get knocked up, ever need a ring that does this?!