Dear Holly,My girlfriend and I have enjoyed a healthy, active sex life for several months now, but I am still feeling somewhat unsatisfied in the bedroom because we haven’t yet fulfilled my ultimate fantasy. Essentially, I would like to dress up as David Cameron, and her as Nick Clegg, and penetrate her vigorously in the rectum while I tell her  how I’m going to reduce her shopping budget by a significant percentage. Although I feel it is my right to demand this special favour, I have a sneaking suspicion it might not go down too well. Can you offer any suggestions as to how I persuade her?Iain,Somerset

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