QUOTE(alohaspirit @ Sep 15 2007, 09:16 AM)

They check your body (while being naked). Urine & blood samples. Chest X-Ray. They'll ask you questions like medical conditions you may had in the past, any past surgeries, when is the last time you had sex, etc.
I didn't have to give a urine sample, and I wasn't asked when I last had sex. But I was asked when my last period was.
I was also asked about a health condition I listed on the form (just another condition that isn't a problem if the patient is treated). The doctor only wanted to know when I began treatment for it and the type and dose of medication I take for it. I had a letter from my doctor about it and my last lab results, but they weren't needed. (But I was glad I had them just in case.)
I was given a paper sheet to cover me for the exam by the doctor, which he partially removed for the prodding part. I was allowed to keep my underwear on.
It sounds like it depends in part on the doctor you go to.
Do a search for medical reviews of the doctor you'll be going to, and you'll get more information.