Go here: http://www.google.com/ads/preferences - go down to demographics. Google thinks I'm a 35 y.o. male, interested in Sci-Fi, and gadgets.

I'm guessing google thinks you won't get breast reduction.

"No demographic categories are associated with your ads preferences so far."

I don't really know what this implies in terms of ads, but I'm not complaining ;)

Strange. I was like OP. 11 ads (3 top, 8 side), 9 results, 3 images.

This was my experience as well. Are you outside of the US?

Yes.