Hello dear Understand your concern Following are the causes of erectile dysfunction: 1. Psychiatric cause: excessive depression, sexual anxiety , relationship problem 2. Medical cause: diabetes, hypertension, damage to back nerve/spine, smoking and alcohol consumption, prostate enlargement, fatigue, low testosterone etc Frequency of sex depend upon your sexual desire. Alternate day sex is good. You should consult the psychiatric and urologist for better evaluation and proper treatment. Doctor may give following advice: Spend more time in the foreplay before sexual intercourse, use double condoms, pelvic exercise, try women on top position, hold urine before urination and pelvic exercise, also start regular exercise like walking and yoga in the morning daily, avoid alcohol and smoking, take healthy diet and fresh fruits, antioxidant (almonds and tablet Co Q). If above advice will not work, you can use sildenafil and paroxentine 30-50 minutes before sex and testosterone injection, but should betaken after proper evALUATION Hope this may help you Best regards Dr. Sagar