In the past, the principle of continuous erection of the penis was thought to be caused by blood stasis caused by obstruction of the venous outflow tract of the corpus cavernosum of the penis. The blood stasis in the sponge body lags behind, the viscosity of the blood increases, the oxygen content in the blood decreases, the acid base decreases and becomes acidic, the carbon dioxide c... https://www.viagra-hk.cn