The veins in your scrotum are twisted or swollen. Your testicles may not have grown the right way. Your semen may go back into your bladder. You may not keep an erection. You may have had surgery or a medical treatment.
Men also become less fertile as they get older.
You and your partner will have thorough exams. A test of your semen. This checks how many sperm you have and how healthy they are. These tests check for infections and hormone levels. An exam of fluid from your penis to check for infections.