I walked out of the bathroom into the bedroom. I was naked after my shower. My wife, Jenny, still dressed, was sitting on the edge of the queen-sized bed. “Sit down beside me, Bob,” she said, patting the bed. I sat down. “I want you to fuck Ethel,” she said in a matter-of-fact tone. She kissed me on the cheek. “What!” I exclaimed, pulling my face away and staring at her. Ethel had been Jenny’s best friend for fifty years....