It's a pity that society has devolved to such a point, but that's where it is for a growing segment of society. Aggressive feminism poisons male-female relations, making it a constant power struggle. Remove the sense of ownership and entitlement, and the power struggle recedes.
My understanding is that women rebel against the “exclusivity” expectations simply because it is typically assumed to only apply to women(or at least more strenuously towards women) and also that they naturally prefer exclusivity if not for this specific contention.
Therefore, I believe I have a marketable concept with my idea of a “FWB+exclusivity+marriage cert.”. My concept implies that the exclusivity works both-ways or no-ways.
Now, lets examine the “exclusivity” concept. Certain kinds of women are uncomfortable with the morality concepts that demand exclusivity. They do so because they feel these antiquated codes of morality were designed by men to help men subjugate women. If we separate out the concept of exclusivity from morality, then we stop antagonizing these kinds of women. Assuming these women have innate inbred desires of exclusivity hardwired into their brains(which I think is the case) I think we can convince them to go with their natural urges simply by removing the stigma(as perceived by them) from it...which is traditional biblical morality.