Government is involved. Once you answer the question, it is in your medical records. If insurance companies decide to look, it will be there. If government decides to look there, see Rush's case, they will.
Doctors have NO legitimate reason for asking this question as a screen. It is what is is known as a boundary violation. They can be taken to task for asking it. They do not have any expertise in the area and are unqualified (with some exceptions unrelated to their medical education) in the area to boot.
Robert Paulsen's post says it all!!!
DK
So don't answer the question.