There are lots of ways to find casual sex, but I had a favorite routine. It began with dining alone at one of several East Side restaurants near my apartment, places frequented by businessmen and diplomats with some connection to the United Nations. I would order a salad and wait for a glass of wine to arrive at my table. Then I’d either wave my thanks, or, if I found the man attractive, make my greeting slightly warmer, so that he knew he was welcome at my table. I kept conversation to a minimum; if I let it go on long, I’d found, the man ceased to be attractive no matter what he looked like.