Dr. William Masters once said that a professor of his told him not to do any sex research before he was age 40 because people would not listen to him. It is important to note that the field of sexology has many disciplines. Not everyone becomes a sex therapist. Sexological disciplines may include such wide ranging interests such as law, chemistry, sociology, biology, art, journalism, history, etc. The student must be fully self-starting as there is little direction or guidance provided by the school and no prodding to complete work on any schedule.
Many people hang on for years and years.
I know I took longer than I should have. The school seems to have a policy that everyone is entitled to try for any degree, so entry requirements are somewhat suspect, and many undisciplined students simply fall by the wayside due to myriad difficulties of getting through. Everything is measured by an exhausting and really comprehensive examination that lasts a full day, following the satisfactory completion of all scholastic requirements, and prior to gaining doctoral candidacy status. Only then does the dissertation or project begin. The Ph.D. and the Ed.