Hello dear I understand your concern Absence if erectile dysfunction could be due to defect in nerve supply, blood supply to penis. Following are the cause of erectile dysfunction: obesity, hypertension, problem in back nerve, excessive alcohol and smoking, hormonal imbalnce/low testosterone I would suggest to consult urologist and undergo routine blood tests like complete and diffrential blood count, ESR, CRP, serum testosterone, serum cortisol. color doppler USG of scrotum/pelvis to diagnose cause. If all investigation come normal then problem could be due to psychiatric issue like stress/anxiety regarding future performance, fatigue. It should require psychiatric consultation and counselling. Meanwhile avoid stress, take healthy diet, drink plenty of water, do regular exercise for 30-45 minutes in morning followed by yoga. Tablet CO Q and gonadil F Do moderate masturbation regularly Hope this may help you Contact further if follow up needed Best regards Dr. Sagar