Should a doctor treat a masochist patient with pain?

Medicine and technology have improved so much that it's possible to go to the dentist and if the dentist is good not feel a drop of pain, something that was not possible years ago. That kind of medical treatment, however, assumes that all patients like to avoid pain. What if a patient is a masochist? What if the patient actually prefers treatment with pain over one without? Asking this question to a patient would be the politically correct thing to do and for patients who are masochists it would mean respect and more satisfaction. If we establish the right of the masochist for a treatment with pain, does the doctor have the right to refuse such treatment to a patient who asks for it? On what grounds? The treatment will heal the patient.

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