The normal physiological response of men is erection after sexual stimulation, spermatorrhea, morning erection and so on. 1. Erection after sexual stimulation: erection after sexual stimulation is a normal physiological reaction of men, which is mainly manifested in the phenomenon of normal physiological erection after being subjected to visual and mental sexual stimulation. 2. Ejaculation: After entering puberty, men’s reproductive organs and secondary sexual characteristics will slowly develop, and men may experience the phenomenon of ejaculation. As the reproductive organs mature and the secretion of androgen is strong, sperms will be produced, and if there is no sex for a long period of time, the sperms will be overflowed during sleep. 3. Morning erection: Morning erection is a normal physiological reaction of men. Under normal circumstances, adult men will have a morning erection every morning. Morning erection is the unconscious erection of the penis, this erection does not have any sexual stimulation, which is also a normal physiological reaction of men. In daily life men should also do a good job of protecting their reproductive system, reasonable rest to adjust their habits. Eating more vegetables and fruits is better for your health. Reasonable physical examination, to rule out the possibility of abnormal diseases.