The Guardian’s sex advice column is coming to an end after 20 years. Here are some of the most memorable questions and answers• Pamela Stephenson Connolly on two decades of solving readers’ sex problemsMy wonderful new wife is everything I have always looked for in a woman. The issue is that she is openly and proudly bisexual. When we first became involved, she even joked that she didn’t want me getting mad when it was time for her to visit her friend on girls’ trips. A threesome with a bisexual woman has always been my fantasy. She even gave me permission to go online and find a “unicorn” for us. But when I set up a meeting, she didn’t seem to want to follow through with it, so I stopped looking. Recently, on holiday, she made a sexual comment about a girl in a bikini, so I again brought up the idea of a threesome. But she said she might have grown out of that phase of her life and just wants to be with me. She also said that adding another person would ruin the marriage, and I wor...