The common reasons for the absence of semen discharge during male ejaculation are: 1. The testes have lost their normal spermatogenic function, seen in patients with congenital testicular dysplasia, azoospermia, post-viral orchitis, granulomatous orchitis, testicular tumors, and testicular atrophy. 2. Although the testes have spermatogenic function, the vas deferens is blocked, seen in patients with chronic epididymitis, epididymal cysts, tuberculosis of the epididymis, inflammatory blockage of the vas deferens, and Patients after vasectomy. 3. The opening of the seminal frenulum has changed direction and semen is discharged into the bladder after ejaculation, called retrograde ejaculation, seen in patients with chronic urethritis, prostatitis, seminal vesicle adenitis, and post-prostatectomy. 4. Patients with excessive mental tension, seen in patients with early marriage or premarital sexual intercourse.