Dear service user, Thank you for writing to healthcaremagic. I got your question and understand your concern about erectile dysfunction. The possible causes of erectile dysfunction are 1. Diabetes (nerve damage and vessels narrowing) 2. Some medicines like anti depressants and anti psychotics 3. Performance anxiety (the most common reason) 4. Psychiatric disorders (depression, anxiety) 5. Alcohol use (nerve damage and testicular injury) 6. Smoking (vessels narrowing) 7. after some surgical procedures (nerve damage). 8. Penis fracture (injury to sex organ itself) 9. Low hormonal level (rare cause) Let me know whether you achieve and maintain a good quality of erection in sleep, in the early morning, during masturbation but not at the time of coitus? If you are able to achieve and maintain erection in any one of the above mentioned situations than your problem is more likely psychological rather than physical. I recommend seeing psychiatrist to find out cause of erectile dysfunction in your case. There are effective counseling techniques and medications which can help you. Wish you good health.