"If you don't mind me saying," I persisted, dropping a bit of my affected professionalism, "You are an attractive young lady. I imagine you could easily get a date if you were so inclined. There must be some reason you go to have anonymous sex instead. What do you get out of it that you can't get in a date? What makes it better?" She looked at me viciously. Her eyes were inflamed and her face was flushed.

"You don't know anything," she said, "This was a mistake, you can't understand," she said. I became nervous that things were rushing out of control.

"What do you mean?"

"There is nothing...