Soft after ejaculation is a normal physiological phenomenon, and is not a disease, this is due to the penile erection requires an increase in the blood supply artery of the penis, thus making the spongy body of the penis congested, at this time the libido will be significantly higher, and in the attainment of ejaculation after the arteries of the blood supply of the penis will be dramatically contracted, which leads to the reduction of the blood supply of the penile part of the blood supply, spongy blood supply is insufficient, there will be a phenomenon of penile softness. Men during sex can usually be divided into three phases, the excitement period, orgasm, the period of inactivity, the period of inactivity usually refers to men in the ejaculation after the penis weakness, libido, short time can not be erected, and so on. During sexual life, we should avoid unclean sex and pay attention to the hygiene of private parts to avoid infection.