Usually a doctor will check for any abnormality or problem.
If you're uncircumcised, he may retract the foreskin
(don't let him talk you into circumcision--it destroys sexual sensitivity and doctors are too anxious to do this because they make money from it and religious groups are always trying to force this practice on others._
He will probably feel your testicles, checking for growths and also press up gently in your scrotum to check for possible hernias.
It's a little embarassing, but necessary, and everyone goes through this, so don't be overly anxious about it.
Most genital exams are done with the patient standing and the doctor sitting, but it is possible he will have you lay down.
Generally speaking unless you are having pain or are having
a problem with your penis or testicles a doctor can simply have a look at you genitals while you are standing or laying down in his exam room. If you are having pain or are getting a full medical examination then the doctor will gently grasp your testicles/scrotum and ask you to cough. He is testing to see if you have a hernia. Either way try to relax as the doctor is a professional and he has seen tons of others boys / men
nude before. I know you may feel embarrassed but there is nothing to fear.
You will be standing up straight. The Dr. will put on gloves and then check your testicles (balls) for lumps or unusual growths, ask you to turn your head and cough (he will be checking to see how your testicles react when you cough) and then he'll tell you you can pull you pants back up. He will probably not even touch your penis (99% of the time) except to possibly move it out of the way. Don't worry about it...it's not a big deal and it'll be over in a minute. RELAX
Most likely you will stand . He will grab your balls to check for any thing abnormal.Then he will push a finger along side of your penis and ask you to cough to check for hernias.but he wont grab your penis and if he does run like hell.
dont worry about it he will place a couple of fingers under your nut sack and tell you to cough....Now watch out when he gives you the digital rectal exam, Make sure he has only one hand on your shoulder when he inserts his finger
If you are uncircumcised, the doctor will probably check to make sure that your foreskin is fully retractable. If not he/she will probably recommend circumcision - this is a very good thing which all parents should really do for their sons when they are small, so if your parents did not have it done for you, take this opportunity to get their mistake corrected and you can look forward to the benefits which only circumcised men (and their female sexual partners) understand and enjoy
Personal experience - I chose to be circumcised as an adult and it provided me with much better hygiene, comfort, appearance, self-esteem and FAR better sexual sensation and pleasure during intercourse, both for myself and my wife. It's great to be circumcised!