I have had E.D. once in a while for 10 or more years. Then I read David Deida's book, "The Way of the Superior Man" where he briefly mentioned Taoist breathing where you breathe in from the top of your head down the front of your face, neck, chest, belly... all the way down to your balls and penis. I tried it laying on my side and visualizing the energy going down there with my breath as I let go of all tension letting it be swept away by the energy. Within minutes I had the hardest erection I've had since I was a teen ager (I am now in my mid fifties). This is only one of many practices that you can use to build the sexual energy. I recommend checking out Taoist lovemaking books by Mantack Chia who is a true master of these arts. It may take you longer than it did for me but it WILL be worth the effort and it will help you heal the wounds that have you feeling that you are not a man in the first place... Good luck!!