Is usually along the same lines as what would creep myself or any other provider out. On a first date or even the third, it is inappropriate to me to ask intimate questions like: "What is your real/first-last name?" "May I come to your home/apartment?" "What would it take for you to be my exclusive friend/girlfriend?" And so on, and so forth... (I'm sure by now you get the point of what would be deemed as an 'inappropriate question.')

I don't doubt though that some times both provider or client make a slip up and ask what -they- think is an innocent enough question like how many children does one have or where one graduated from but the key note is to always -respect- somebody's boundaries once they told you: "you've crossed it buddy." Will those things always be a touchy subject though? Maybe not, depending on how close you get to one another and how much trust is developed, a la Iconaclassic's situation above. One just has to feel out how far they can go and respect the line.