I'm really turned on by girls who are either nurses already or studying to be one. I am also turned on by scrubs, nitrile/latex gloves, and surgical masks.
My ultimate fantasy is playing the role of a patient who gets strapped down to a stretcher with my feet in stirrups, legs spread apart, and getting a prostate exam/massage simultaneously with a gloved handjob (with lots of lube).
Ideally, I'd meet someone with those interests and end up in a long-term romantic relationship with them.