Hello Tayab.. Regarding the problem of Erectile dysfunction, it is due to decreased blood supply to the penis. And medications like Sildenafil, etc. increase blood flow to penis & maintains erection. It can be improved by having a diet rich in fruits, vegetables, fish, nuts & honey. Other than that, avoid stress...practice meditation..this helps in improving concentration & builds up the confidence level. Avoid smoking & alcohol. You can also do oil massage of the penis...it increases blood flow & maintains the erection. One more thing...avoid consuming any over the counter medication which claim to increase the size of penis or improve performance...it may be harmful. Best thing is to eat a healthy diet, exercise regularly, avoid stress, get good sleep, think positive and stay happy. Wishing you a Healthy Life. Take care.