Not only was I asked if I'd paid for sex, but as part of a quick chat about it, was asked if this was (in the nurse's words) "with escort type girls, or street girls" - when I answered with escorts, I was told that was good, as they generally took good care of themselves, and that a number were checked out there on a regular basis. As others have said, I was asked if I thought I would pay for sex again, and I answered honestly that I probably would.
I was then offered a full batch of tests, the hep b vaccine and advice, and it was recommended that I pop back in occasionally to get checked out, and that I could get in touch any time if I had any questions or concerns.
I said before when writing about my trip that I didn't feel judged at all - the questions were purely to find out how to offer me the most appropriate tests, advice and vaccination. It was actually a far more positive experience than I'd expected, and nothing like as embarrassing as I'd feared.