Yes. But once enter the door, it's the YMMV world.orrrrr you could simply ask the Lady in question if she is willing to provide you said service.. cuz no matter what someones idea of PSE will be different than yours and mine and his and of hers
BTW, I have a 3 step approach.
1st. At the beginning of the session, asking the SP if I could do the things I want.
2nd. Setup a signal and word the SP can use to stop me if she feels uncomfortable.
3rd. Even if the SP is ok with certain actions, I still test first. For example gagging. I do one gagging first, ask her how she feels so that I can do adjustment.
The basic idea is to give the SP the chance to say no/stop at the beginning of the session, before the rough part take place, and during the rough part. So far, sometimes I got what I want. Sometimes I didn't. Do you think if there are anything I can improve?