PULLING DOWN UNDERWEAR
In an otherwise non-medical setting:
Feeling the knuckles against my waist, they have a hold of a section of my waistband.
With the desire to expose me, and they have the control to do so.
My hard penis waits with anticipation at the unveiling.
The rush of anxiety and feelings that come along with knowing of their desire, and the anticipation of what's to ensue
The excitement
Maybe they count together to 3 or 10 in unison, before I feel the simultaneously slow movement of several sets of knuckles downward against my lower torso. Passed the magic mark, my genitals spring out, sensing the hands that are nearby, eager to be gripped by them.
Suddenly, my body transforms into a chemical manufacturing plant. The workers surrounding me are there to get the job done. For my body was meant to produce, and my mind was meant to really enjoy it.
Now consider the medical exam situation, "Pulling down underwear for genital exams". The sensation of someone pulling down your underwear. It's a signal you can physically feel, of someone else wanting to see, wanting to examine, wanting to touch.