Mayfield, who is intersex, was born 47XXY, meaning she has one additional sex chromosome. This left Mayfield neither completely biologically male nor female, but both. Raised male by her parents, Mayfield transitioned to female after having to be placed on estrogen due to health problems and to save her life.
Tells the story of Rob Wilson a Tasmanian Chicken and Pig breeder who also happens to be XXY. Rob was born with two complete sets of male and female gonads and was operated on as a child so they would present more male like in appearance. With the assistance of fertility treatments he went on to 'father' children and by all accounts has lived successfully in that role.