Reverse ejaculation refers to a man who has a normal penile erection, the action and sensation of ejaculation after reaching orgasm, but no sperm exits the urethra. It can be checked by urine examination, prostate fluid examination, semen examination and other methods. 1. Urine examination: through masturbation or after orgasm during sex, urine is retained for urine examination to observe the presence of sperm and fructose. 2. Prostate fluid examination: By checking the presence of sperm and fructose in the prostate fluid, the presence of spermatozoa produced by the contraction of the seminal vesicles and peristalsis secondary to the vas deferens is clarified. 3. Semen examination: to check whether there are sperms and fructose in the discharged semen. As some patients with retrograde ejaculation, they are able to ejaculate smoothly and have a lot of semen, but there are no sperm and fructose in the semen. Retrograde ejaculation can also be examined by excretory cystourethrography and urodynamics. Once the presence of retrograde ejaculation is detected, it is recommended to seek medical attention and examination under the guidance of a doctor to clarify the cause of the disease and treatment.