Well, I once had a problem with enlarged lymph nodes in my groin
region.
Knowing that the doctor would have to examine and possibly
palpitate the area, I requested a male doctor.
At another time, though, I had a bladder problem and required
catheterisation for tests to be conducted. It's extremely painful
and suffice to say, it's not something any guy would want to go
through. And what's more, the only urologist available at that time
was a woman.
And somehow I don't remember any local anaesthetic being used in
the procedure.
To those who don't know what catheterisation is, you may way want
to read this to understand why I say it's extremely painful and
distressing:
http://en.wikipedia.org/wiki/Urinary_catheterization