Originally posted by Moxie:
More seriously: They check to see if you have a hernia - by examining, & sometimes feeling, the scrotum. Nothing to do with the prick itself.
I've also kena this before outside; the difference was the civilian doc asked for a sneeze, rather than just a cough.
Appendum: A good tip would be to lay off the caffeine & also don't over-hydrate beforehand. Empty your bladder prior & keep an open mind. The whole process can be a bit of a cattle call, quite monotonus & alienating as your detail gets shuttled between stations. Used to get very cold as well (before the current bathrobe thing) & of course there's the embarassment of moving around in your underwear in a crowd.
There's also regular stories about how so-&-so - while anxiously trying to adjust to the various conditions - ended up getting a hard-on in time for the hernia check, & then try to look nonchalant (amid suspicions of being perverted or something) .... haha.
You will get a chance to empty ur bladder during the urine test

so... dun empty b4 u go

jus an advise.