Retrograde ejaculation and inability to ejaculate are both manifestations of male sexual dysfunction, and have in common that semen is not discharged from the urethra during sexual intercourse, but they are fundamentally different in terms of symptoms, etiology and pathogenesis. Retrograde ejaculation can reach orgasm during sexual intercourse with ejaculatory pleasure, but only the semen is retrograded to the bladder, such as diabetes, spinal cord injury, neurogenic bladder, urethral stricture and prostatic hypertrophy via the urethra After excision, retrograde ejaculation may be produced by taking drugs such as reserpine and quazepam. Primary inability to ejaculate is when the male penis never ejaculates in the woman’s vagina, secondary inability to ejaculate is a history of ejaculation in the vagina and later inability to ejaculate, absolute inability to ejaculate is the inability to ejaculate regardless of sexual intercourse or masturbation non-coital sexual activity, selective inability to ejaculate is the inability to ejaculate in the vagina during sexual intercourse. The majority of ejaculation disorders are due to psychological factors. Most cases of inability to ejaculate are caused by psychological factors, so psychological treatment is necessary.