Dear service user Thank you for writing to HCM. I can understand your concern about erectile dysfunction with your partner. Common reasons for ED 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. Low hormonal levels (rare) Anus infection has no relationship with erectile dysfunction. 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. Cause of erectile dysfunction should be ruled out for proper treatment. Mostly it is due to stress and anxiety. Situational reasons like fatigue tension or own pressure to perform rather to enjoy is very common. I recommend you to discuss this problem with your psychiatrist. He will assist you to find out reason for this problem in your case. There are potentially effective and safe medications as well as behavior therapies for erectile dysfunctions. Psychiatrist will identify the best suited for you after knowing your history. I hope this will help you. If you have any further questions I will be happy to help. Wish you good health.