I have a very dear friend whom I am penpals with- have been for 15 years .... He is a eunuch. However he went to a doctor to get it done. One can live a normal life as a eunuch- just without sex. Or at least some kinds of sex. Your friend did this out of a desire for self-harm and thats different. I wish him all the healing vibes both physically and mentally. And Im sorry for your loss. I know this is hard but it will get better.