Hi Milkyjoe,
This is probably not what you want to hear, by my OH had to drop his pants and the doc checked that everything was all in order! I'm not sure if all doctors do this though (in which case avoid the doctor in Upminster, Essex where we went!)! Try do a search on this website for the doctor where you plan on going and see if anyone has been there and what the have to say about it.
The doc then made us touch our toes, apparantely they want to check that your spine is ok so as you may have guessed, you have to do this in your underwear! Fortunately they don't mark you down if you are not very flexible and cant touch your toes
The stripping part was the worst of it, the rest was standard height, weight and bloodpressure. Not too bad, but a heck of a lot of money We spent £600 for the two of us and it was finished in about 10 mins!
Good luck and try not to stress too much about it, it will be over before you know it!
Hayley