I've seen posts about this elsewhere on the site, but perhaps here would also be a good place: what do you feel to be the psychological basis for your medical fetish? As an example, in my case, it's a resolution to having been sexually assaulted by the family minister, an authority figure. The doctor is another such figure. The doctor or nurse requests you to take your clothes off, examines you naked. Yet the trust is (usually) justified: the doctor does not take advantage of the opportunity. You end up examined, not violated. In short, my pattern of seeking physical exams was, in part, putting myself in a vulnerable position with fixed limits.