Morris began medical transition in 1964. In 1972, Morris travelled to Morocco to undergo sex reassignment surgery, performed by surgeon Georges Burou, because doctors in Britain refused to allow the procedure unless Morris and Tuckniss divorced, something Morris was not prepared to do at the time. They divorced later, but remained together and on 14 May 2008 were legally reunited when they formally entered into a civil partnership. Morris detailed her transition in Conundrum (1974), her first book under her new name, and one of the first autobiographies to discuss a personal gender reassignment. The opening lines of Conundrum have since become famous “I was three or perhaps four years old when I realized that I have been born into the wrong body, and should really be a girl. I remember the moment well, and it is the earliest memory of my life.”