It is normal for something to flow out of the penis just after a reaction. Sexual excitement when the penis is stimulated by the spongy muscle swelling, will compress the paraurethral glands, will flow out of the turbid viscous liquid, turbid viscous liquid is also one of the components of the semen, smooth urethra function. Male penis stimulation after sexual excitement, the outflow of this liquid is a normal physiological situation, the outflow of this liquid, and testicular fluid, vas deferens, epididymal gland discharge, epididymal fluid, etc. with the composition of seminal plasma, and then add spermatozoa, constitutes the semen. Men who are sexually stimulated will have an erection, and repeated stimulation of the penis to a certain degree will result in orgasm and ejaculation. If repeated stimulation without ejaculation will cause the prostate gland to appear congested secretion of prostatic fluid, and a small amount of prostatic fluid from the urethral orifice, if there are no other uncomfortable symptoms, is generally considered to be a normal phenomenon; if it is a urethritis or prostatitis, the penis will flow pus liquid or accompanied by pain in the urethra, need to consult a doctor for further diagnosis and make the appropriate treatment.