What are the primary sex organs, or gonads, of males? What are their two major functions?

What is the primary function of the epididymis?

Mr. Hassan has recently started getting up during the night to urinate and has also noticed that he is having trouble emptying his bladder. He has made a doctor's appointment, but his wife has already told him that the doctor will want to check his prostate. Do you think his wife is correct? Explain your answer.