When I was in middle school (1964), I joined the army (air force) for a physical examination. Finally, I was naked and entered two students at a time. The examiner is a man and a woman. I want to check the anus and genitals to see if there are hemorrhoids, whether the foreskin can be opened, whether there is cryptorchidism, whether the scar of trauma exceeds one square centimeter and so on. Fortunately, I am a male doctor and my classmate Gao is a female doctor.