John is a bedwetter. For most kids starting school, this is no big deal but John still wore diapers to school.  But by age 12, wetting the bed IS a big deal as is still wearing diapers to bed. But by the time John left school he was still wetting the bed and while not allowed to wear diapers anymore, still took opportunities to do so whenever he could. And the reason is simple... and complex. John is still a baby. A baby girl. And so diapers make perfect sense and using a toilet... does not.