In my experience if the girl offers deepthroat and BDSM, they will usually go for face fucking. Trust however is an important element as has been said before, the girl loses a degree of control, so tends to work better with a regular, or at least a girl you have seen before. My next meet with my regular will be a BDSM session with restraint, so she has to know she can trust me totally. In my view there is no point abusing the privileged position you find yourself in by thrusting too deep or too hard, as it will backfire and probably end up in you losing a good regular. As with every punt, if the girl says no, then it's off the agenda. If that doesn't suit, don't book her.