What do you consider to be the most intimate/sensitive/personal part of your anatomy that the doctor may touch during a routine examination? This isn't necessarily your most erogenous zone. For example, my most erogenous areas are the corona of my penis and my prostate (in terms of sexual stimulation). But the most sensitive, the most personal thing that the doctor touches is definitely my testicles.
I'm not saying the two concepts may not be the same thing, but be aware that they are not necessarily the same thing.
I remember when my doctor did my first testicle exam on me, the sensation of my testicles in her hands was just overpoweringly sensitive... I think it is what really got me into MedFet.
~ Humble Patient