In this book an attempt has been made ti indicate the present trend made to indicate the present trend of opinion, more particularly in the medical schools, on the phenomenon known as intersexuality and suggest the ethical problems that it raises for Catholic medical practitioners and for priests who may be called upon for their solution. The subjects under the Medical Ethics series were not conceived without difficulty. Yet the fact remains that ignorance cannot be accepted by those who have the charge of healing and of formation: doctors, teachers and priests.