A young medical student made the acquaintance of a young girl who had previously given birth to a child. The girl did not want to reveal her secret to her lover, and fearing that, as a medical student, he might discover her secret in initu, she refused to grant him her favor. One evening while alone with her in his room, he tried hard to accomplish his desire by persuasion, caresses, and other means. When just at the point to break her resistance, the erection suddenly ceased, and the penis shrunk to half its normal size. From this moment he suffered from complete impotence. Even nocturnal erections did not take place any longer. The impotence resisted every kind of treatment, until, one day, the girl wrote the patient that she was now willing to yield to his desires. At the first meeting following the letter, puella tentavit actively to arouse his passion, and he succeeded in having a powerful erection actionis peragendo. From this moment he was cured from his ailment and enjoyed his full virile power of former days. This case shows the vast influence the psyche is wielding even upon the unconscious state of the brain during sleep. The stimulation of the inhibitory centre was so strong as to prevent even the occurrence of nocturnal erections. In illicit relations, the fear of surprise or of infection, shame or loathing may have inhibitory effects upon the centre of erection and cause psychic impotence. Violent shocks to the nervous system, as great fright, pain, or grief, etc., and all other strong emotions which often affect the urinary system by causing temporary frequent micturition, polyuria, or glycosuria, may also give rise to disturbances of the sexual functions and cause psychic impotence of a transitory nature. Over-estimation of the difficulties of defloration sometimes causes temporary impotence in nervous newly married men. The timidity of inexperience may in the same way have the effect of an anaphrodisiac. Sometimes the exaggerated veneration of his young wife may cause temporary loss of vigor in the young husband. The thought that such an exalted personality, as his young innocent wife, should have to submit to such an indignity (not a few have this strange opinion of the conjugal act), works as an inhibition of the proper performance of the act.