Hi onion is very good vegetable to treat sexual impotence. It increases libido and strengthens reproducing organs. White onions are best for this purpose. Take about 5-10 gm root powder of Ladyfinger in a glass of milk. Add 2 tsp of mishri in this milk and drink it. This will prove helpful in improving sexual vigour. Apply pranacharya gopal oil on your penis and give a massage. It will strengthen your nerves and erection power will get better. You can take ayurvedic medicines too along with this.