I did find once on an outcall that went very bad that the lady (not the same as pictured, but I was pretty new to the hobby) entered and asked, "Is this for me?" I nodded, she took the cash and everything went downhill from there. (This took place in D.C. and I learned that it really is only the politicians that screw you there. LOL).
As a result, now for most OC I wait until I am sure this is the lady I wanted to see or until our visit is over before I respond to that question, "Is this for me?" I found that usually there is no discussion by reputable ladies and have no problems of that kind since. We live and learn I guess, and even an old dog can learn new tricks (no pun intended).