Here are a couple:

1) What are your sexual experiences as a Dominant? How many previous partners and how long have your relationships last?

2) Why did your last submissive leave? Do you stay in contact with them? May I contact them for a reference?

3) If you told me to do something which I have a problem with, how would you react?

4) Have you ever hit anyone in anger or been told that you have anger issues?

5) Have you ever been in a scene where things have gone too far or gotten out of control? Please tell me about it.

6) Do you have any emotional issues that I should know about? What about medical conditions that might affect your performance?

7) Have you ever been convicted of anything or been a party to a lawsuit? Has anyone put out a restraining order on you?

8) What level of control will you assert over my body, both inside and outside of our sessions? Will I be expected to cum on demand?

9) How active is your social life? Will I be expected to attend public events with you? Will I be expected to meet/entertain your friends, colleagues, or family?

10) Have you been tested for STD’s since your last sexual encounter? How long ago was that? Would you go with me for us to get tested together?