Why jump straight to "I'm a urologist"?
Keep it vague, have an air of mystery about you. Let the women fish out what it is that you do. Think of yourself as a riddle that they have to solve. Try this next time..
"What do you do?"
"I help people. So what do you think of this part of the city?"
....blah blah 15 minutes later and she's curious....
"So how do you help people?"
"With my hands...sometimes I use my brain and sometimes a shiny metal object...so tell me more about your hometown"
....blah blah 15 minutes later and she's more curious....
"What exactly do you do for people with your hands?"
"Well, I listen to them, the problem they're having, and provide reassurance that things will be ok and sometimes that requires the use of my hands and that shiny metal object I mentioned earlier."
...blah blah 15 minutes later and now she's getting horny...
"No really, you're being really vague now. Can you at least tell me where you work?"
"It's a place where some go to die, some go to live. It's a place where others receive hope, yet some don't. It's a place filled with paradoxes. Tell me about your last out-of-country trip you took."
.
.
.
and so on...
At some point, you will have to cave, of course. But by then, you will have built up her expectations of what you do and you will not disappoint seeing how being a doctor still makes people go, "Ooohh...that's interesting..."