I can't answer these questions for you, but I can give some insight into my own situation. Each relationship is different in its own way, and therefore any agreements that work within that will also be different.
Any questions that I receive from my partner I answer to the best of my ability to do so. My partner chooses to mainly ask questions that concern my safety and location - reasonable things to know whatever the situation. Rarely, she may ask more personal things of me which I deal with honestly. I have some discretion to warn that details once known cannot be unknown and I made it clear from the beginning that I would not divulge anything persona/revealing about whomever I was engaging with. It is a very difficult balance sometimes, but is the price of ensuring my partner feels secure.
We have been together for very long time and that kind of shared history means a lot to me and I only put it at risk to the extent that I do because it means so much to learn more about myself in this life. I have always been solid as they come and dependable, and I hope I have shown her over the years that I could be trusted, long before this situation arose in our lives.
My partner is not interested in this kink whatsoever and in truth, I'm not sure she has the characteristics that would allow for a successful kink partnership in this area even so. Rather than force me to choose between parts of myself, she consents to me engaging in both. This is something that I am very thankful for, and that ensures I behave as ethically and honestly as I can. The people with whom I have had conversations I hope can attest to that
Are there large gaps in this sort of arrangement? You bet! Could someone who wanted to act selfishly get a way with a lot? Without doubt! I make sure to be present and in the moment in my 'regular' life, and to always provide contemplative time for questions to be raised and answered. Any time something unforeseen arises, it has to be dealt with by communication. I can't really talk much more as that's as far as I am with it myself.