The forming of a female genitalia and urination

In the classic story "A life ever changing", Ricky/Rachel gets operated on to receive a female vulva (the correct term for the outer genitalia). In the first phase, Rachel is declared incontinent and dressed in adult diapers. How true is this with operations to give a temporary/permanent female genitalia? I love to have stories where the transiting male-to-female has to wear diapers due to the operation.