This is an interesting read. What I was left with was, how does a professional dungeon not have a safety monitor for a prosub session? Clients may or, may not know what they are doing as Doms. They may or, may not follow the rules. If the sub genuinely enjoys the play, she may get into deep headspace and, not be able to monitor the client. I've zero experience with pro subs. But, I have wondered how it is that works in keeping them safe and, the experience real. Anyway, this is an interesting account of a young woman who spent 3 years working as a prosub in a California dungeon.

https://www.huffpost.com/entry/professional-submissive-bdsm-dungeon_n_5d9213d8e4b0ac3cddac418f