Three naked young Marines. Four concealed cameras.
Three individual real-time medical examinations. One VERY thorough MD. 'Nuff said:

A stalwart, 30 year-old square-jawed football playin' Marine with a very healthy pecker on him.
A dead ringer for a hairless Dick Tracy.

A clueless California surfer Marine with a fresh PA, easily baffled by complex requests such as
"Bend over, lower your chest, spread your buttcheeks."

A compact little grunt; cute-as-a-button with huge hands. He's hesitant to do a routine testicular self-exam because "it feels like I'm playin' with myself, Doc!"

Each patient is made to strip naked from the get-go and to park themselves on the exam table. This MD conducts three by-the-book exams: yes, ears, throat, heart and lungs get checked; a few minutes of humiliating Q&A about the functionality of the boy's genitals; a urine specimen is requested. A micro-camera hidden directly above the table captures the patient lying helplessly on the table during the palpation sequences and one of our new digital cameras is trained on the guy's genitals and butt-hole for the inevitable hernia check and anal probe.

These video images are so clear that you'll swear that you're sitting in 12th grade health class, watching a live demo on how administer a testicular self-exam. We even considered applying for government funding to distribute this one!