Many perverse expressions of things are just twisting something that was intended by God to be proper and good into something filthy, hence the term perverse or perverted. For women, this is one of them. They were designed to be obedient helpers who thrive under the control and direction of a strong man. Eve screwed this up by being disobedient, and one of the sins woman has carried ever since is having the desire that God placed in them, to be subservient to a man, and their own rebelliousness, constantly warring against each other.

Women's rape fantasies are just those God given desires and purpose being unfulfilled by everyday life and needing an outlet, which sin provides an east path to. They ought to be at home serving a husband, honoring him, raising his children, acquiescing to his wishes, etc. This would actually sate that desire, and the need to be dominated forcefully wouldn't build up like it does. But since women don't do that anymore, those natural desires build and bubble over and express themselves via sin instead; rape fantasies and the like.