Psynymph: I read a sticker on a website one day. It said... "I stopped fighting my inner demons; we are on the same side now"...
On the other hand, and to make a difference between a girl feeling like a slut or "His slut", this is bigger than people think.
Just make the comparison: a vanilla woman married to a man in a classical monogamist marriage, and a prostitute. One of the two won't give her presious-ness to anyone but her husband, and the other will give it to anyone as long as there is retribution, usually monetary retribution.
Now, the question: which one is closer to a true submisive girl who loves her Master? The vanilla woman or the prostitute. I think I need not answering this, but I want to add one thing: a girl who calls herself "My slut" makes me proud, and makes me love her even more.