Dear Welcome to HCM We understand your concerns I went through your details. There are many reasons for erectile dysfunction. Lack of male hormones, diabetics, hypertension, organic disorders, some drugs, stress, anxiety, depression etc are prominent reasons. Many of the people are not properly educated about sex and therefore, they become anxious about temporary failures in sexual acts. You need to talk to your friend and convince him to consult a psychologist for counseling. If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute details possible. Hope this answers your query. Available for further clarifications. Good luck.