Kidney Yang deficiency can lead to impotence. There are many reasons for kidney deficiency, which may be caused by congenital factors or by acquired overwork, frequent late nights, frequent sex, masturbation, thoughtfulness and depression, improper diet and other factors. Kidney Yang deficiency refers to the weakness of the body caused by Yang deficiency, mainly manifested as fear of cold, clinical manifestations of fatigue, mental weakness, easy fatigue, fear of cold, body sinking, waist and knee pain, reduced sexual function, impotence, premature ejaculation, etc. You can take medicines for Yang deficiency such as Jin Kui Kidney Qi Pills, Wu Zi Yan Zong Pills, etc. You can eat more yams, black beans, black sesame, mutton, loach, chestnuts and walnuts, all of which have the effect of tonifying the kidneys.