The penis has the function of urination and ejaculation, and the testes have the function of producing sperm and secreting androgens. The penis consists of the head of the penis, the body of the penis, and the root of the penis, of which the head of the penis, also known as the glans, has an external urethral opening at the front end, so it has the function of urination, while the sperm produced by the testes can be ejaculated through the urethra, so the penis has the function of ejaculation. The main conditions associated with the penis include penile cancer and penile redness. Testis is one of the male internal genital organs, located in the scrotum, the spermatogenic lobules in the testis can produce sperms, and the testicular interstitial cells can promote the production of androgens, which plays an important role in regulating the emergence of the first sexual sign and the second sexual sign. Testicular related diseases mainly include orchitis, testicular torsion and testicular tumor. If the penis and testicles appear red, swollen, painful and other uncomfortable symptoms, you should immediately go to the hospital men’s department for diagnosis and treatment, to avoid delaying the condition.