First cage was a home made job well over 35 years ago. My wife was a bit perplexed, but sort got the bondage aspect of it. Eventually the CB6K came to market and we got one. She still thought it a bit weird, but went along. We spent a weekend in the city at a hotel for a music event and I was locked the entire time. She claims that was the first time she ever had an actual orgasm from oral, and she loved it!
Over the years we morphed through various different devices and she had some success being the dominant partner... read books, went to a pro-dom for training, etc. But for whatever reason chastity just never really seemed to "click" for her. Interestingly, she is still the dominant partner in our relationship, but she just doesn't seem to enjoy chastity.
Last year, since we'd been at this so long, I expressed a desire to stay locked full time. She's gone through menopause, and age has done a number on my ability to get and stay hard, so being locked has offered me a place to be comfortable regarding performance, yet still have a fun kink. I proposed wearing the device as a token of my love and commitment to her. At first she seemed for it, but then said she wasn't comfortable with me being in a device all the time. Part of her concern (I eventually learned) was that she was worried about me being "found out", or having an accident and that she would be embarrassed. Not me, her. I guess I shouldn't have been surprised by this as over the years she's never been comfortable with the thought of wearing her keys in public, or me having some kind of chastity themed shirt out in public. She was never concerned with me being ridiculed, but that somehow she would be shamed for it. Eventually this lead to a bit of an argument and in frustration I purged all things chastity in our sex life, save one device, which I gave to her and said do with it as she pleased.
Since then I've tried to play it cool, but after that many years of chastity in our relationship I just couldn't get it out of my head. (There is another thread posing the question "Is chastity an addiction?". I think it may be for me.) Anyway, we've played a couple of times, but only for a day or two, which is decidedly not how I'd like to do it, but I don't push and I don't initiate or bring it up. I leave it up to her to decide. It's frustrating, but in the end you can't force a partner to do something that they're not interested in. (Well, you could, but that seems like the ultimate in topping from the bottom.)