Excellent thread....being a relative newcomer to the hobby, my biggest concern was discretion on the sp's part. Boards like this one helped me search out reputable sp's. After searching for 3 months, I finally settled on a girl in Calgary and had a very enjoyable time. I am now hooked and use these boards to help me in my selection process.
As far as uncomfortable situations, my biggest beef is the gals that insist in using foul language. Most sp's are quite willing to not talk like this as long there is some communication in the beginning.
