I don't do exclusive and I make a point not to hide that from women at any point, but if I suddenly got the urge to I would make sure to mark my territory and hope that she would do the same. You can't really help feeling sexual attraction to other people. That's nature, but the emotional attachment you're describing should be openly defined between a couple for the world to see.
If you Both have Talked it over, and a Title such as "Exclusive" has Come up, you could be in the Stages of Dating, then Mating. It doesn't Mean Official until you both have slapped on another 'Title' that Means "Official," and with this, means In a Relationship, which is More Serious. However, being 'Exclusive' could be that you are Past the Dating stage but are more like a Couple who are Not going Anywhere Anytime soon with Anything Too "Serious" when it Comes to a Relationship, but this is Called then An... Understanding Pact you have Between one Another until Further Notice. Good luck and Great question. xx
It means that she thinks hers is the only vagina I am boning.
I am in this situation right now. This was her asking. No labels, but monogamous during this "testing phase". I feel like she wants a relationship without having to do any of the work that comes with having a relationship. She still tells all her friends about me. Yet I am not officially a boyfriend. She seems like she is getting ready to go those extra couple inches to seal the deal, then backs off. I don't blame her. Right now she can do absolutely as she pleases and does not have to factor my needs into her life. You get it all with this setup.. security in knowing they are locked up.. but none of the stuff that comes with having to maintain an official relationship. I got suckerd!