Hmmm. I'd always enjoyed being restraned by my bf's, but never felt particularly submissive about it. Usually I was the one making the suggestions, etc. So I've only recently begun discovering my submissivness. I think the first concious thing I did was the first time he had me call him Sir. It took me a couple of times to catch onto what he was expecting, and the tone in his voice...., once I finally caught on, when I said 'Yes, Sir.', well, I realized that this had begun to mean more to me than just a bit of spicy sex. I'd used the term, half jokingly, in email many times, but never in person.
Saying it still makes me feel extremely vulnerable...