I remember the afternoon when Katie and John moved in as if it were yesterday. It was one of those mournful autumn days so common in our northern English city when the removal van drew up opposite our house, closely followed by the car containing our new neighbours.Susie was first to speak, “Do you remember the day we moved in? It was ages before we got to know anybody. Anyway it’s a miserable day, so I’m going over to invite them in for a cup of tea while their furniture is unloaded.”Over the next few weeks Susie and Katie quickly settled into the routine of meeting every afternoon for a natter over tea and cakes before our c***dren came home from school. Their friendship soon blossomed and, despite the 10 year difference in their ages, the two women were soon confiding their most intimate secrets.”Do you know?” Susie said one day a few weeks later, “Katie and John decided to start a family as soon as possible after getting married but after nearly 3 years they have just about given up hope. They have decided to have some fertility tests but I’m sure everything will turn out okay.”Several weeks passed before Susie brought the subject up again. “Katie and John are absolutely shattered,” she confided, “The tests show that John produces almost no viable sperm and is unlikely ever to become a father. It’s a terrible blow and has severely affected their love life. They have thought about IVF treatment with donor sperm but you know it could even threaten their marriage.”In the latter years of our marriage we had developed a liberal attitude to sex and joined a select group of swingers which had enriched our lives enormously. It was with this in mind that Susie had a bright idea that might help our new friends, although the subject would need to be handled with the utmost tact and diplomacy.”Don’t you think that if we took Katie and John to one of our sessions it might buck up their sex life, and also give them the possibility of having a baby by natural means. It would be nicer and much more fun than resorting to the indignity of artificial conception with sperm from an unknown source.””It might be just the job,” I replied, “I remember the problems with our sex life that we had when Peter came along so quickly after Lizzy.””Yes,” replied Susie, “I was so busy with the new baby, as well as a demanding infant, I temporarily lost all interest in sex. I thought it would be better for you to find satisfaction in the arms of someone I knew and trusted, rather than have a hole-in-the-corner affair.”Up to that point we had politely declined all invitations to join our friends little group, but without telling me, Susie approached one of her friends and after telling her the situation suggested that she might like to take me along to one of their next dinner parties and to put it bluntly, seduce me.“When you fixed me up with Elizabeth,” I said, “ it probably saved our marriage, and when you eventually joined, our married sex life was so much more exciting, …