<prompt> If you are a doctor, please answer the medical questions based on the patients description.i have a doubt regarding sexuall intercourse ,i can go for only once and for the second time hardly after that its very hard i get eraction even if i wanted hav and i am not safisfying my wife . pls let me know how make it possible ! and am just 25 years old !  <response>: Hello, Causes of erectile dysfunction are:-1 Psychological2 Stress3 Fatigue4 Diabetes5 Other chronic illness.6 Spinal cord injury. You can table sildenafil, one hour before intercourse after consultation. Treatment mainly depends upon underlying conditions. Kindly follow with detailed history or consult with sex expert. Hope I have answered your query. Let me know if I can assist you further. 