After ejaculation, it is soft to consider a physiological phenomenon, considering that the penis has entered the period of inappropriateness, and secondly, it may also be due to premature ejaculation. 1. physiological phenomenon: male ejaculation after the soft belongs to the normal physiological phenomenon, mainly because after ejaculation sympathetic nerve excitation significantly lower, the penile cavernous smooth muscle contraction excessive, resulting in reduced blood supply to the penis, the veins expand, and thus the penis will be from the state of congestion into the state of flaccid, that is, the penis has entered the period of inappropriateness. 2. Premature ejaculation: the occurrence of this disease is related to abnormalities in the secretion of thyroid hormones, androgens and prolactin, and may also be caused by increased sensitivity to 5-hydroxytryptamine, heredity, prostatitis, and excessive mental stress. Patients with premature ejaculation have normal erectile function, but ejaculation and post-ejaculation weakness is too fast, so ejaculation and then soft may also be premature ejaculation. In addition, due to each person’s different physique, so the length of the penis should not be time, can not be generalized, there are obvious individual differences. In summary, ejaculation after the soft may be normal, if there are sexual function abnormalities, need to go to the hospital in a timely manner.