Huffpo has a good article about discussing exclusivity before entering a relationship. Here, the author discusses the modern approach to relationships and the pitfalls of "being in his stable", or as we like to put it, being a plate he is spinning:

No one gets to exclusivity from the stable. I know it’s tempting to think you’ll be the one who can. “If I can just keep my cool, be agreeable enough and hot enough, I’ll get my spot. If I show him I’m not the ‘crazy girls’ he’s dated in the past, that I’m easygoing, chill, and never complain ... then everything will change, in time.”

That’s the bait. And that’s the hook where we get stuck. It’s not about us. It’s not about being good, or being the best. It’s about this type of man’s disposition. He’s not a bad guy. He’s simply in no hurry to make a decision. He’s assuming, as many guys do nowadays, that you’re okay with this set up. Since dating doesn’t automatically mean moving toward partnership it’s free of the rules regarding relationship behavior.

Her solution to the problem is very much like ours:

When’s the right time to discuss exclusivity? This concept needs to be stated as a foundational element, up front. It should be part of a modern woman’s online profile, initial dating statements, and the focal point of her partner selection process. When put on the table as a condition of partnership, it doesn’t need to be asked later as a question.

This isn’t a subject that can be ignored. If exclusivity is ignored for fear of “losing a man,” then it’s already too late. Whenever a woman compromises her values in order to gain admission to the game of love, she’s already set a precedent for future treatment.

Yes she mentions "empowerment" numerous times, and comes at the subject from a very Team Woman approach, but the basic idea is the same.