Etiology and pathogenesis Decline of the Mingmen fire lack of copulative power Fright damaging the kidney, Failure of the penis in erection Impotence failure of sexual ability Downflow of damp heat softness of penis Etiology and pathogenesis Decline of the Mingmen fire, lack of copulative power Fright damaging the kidney, failure of sexual ability Downflow of damp heat softness of penis Failure of the penis in erection Impotence