If I am asked to write a review of the session, I expect it to be public fodder since I am doing it. When I ask a Domme for a reference, I expect that our activities are somewhat public. I also have had conversations with Dommes after sessions were over where I told them that it was ok to talk about our session with others if they want.

In all of those cases, I don't actually have that as a legitimate expectation since I have given consent in different ways to discuss session activities with others. Now, you are speaking of a published book to the public at large versus conversations within the BDSM community so I can see the difference. However, I can tell you that as long as it didn't cross my very hard limits about personal information and instead was just about some funny or sexy dungeon story (or even about how Mistress Ayn actually fell for me on a deeply emotional level based on my performance as a sub... which we all know is incredibly likely to happen) then I would have no problems being part of a book like that.

I know when I help to train new Dommes, I always tell them that mentioning how much she enjoyed some aspect of a session on Twitter (or her website) that the sub would recognize as themselves is a great tool for getting repeat business. It is thrilling to be acknowledged like that for most subs and I can imagine it would be even more so in a book.