So it seems he actually has a physical reason for his lack of sex drive, a low testosterone level. What you must do is get him back to a doctor, either the one he saw or another, and see if there is anything that can be done about this. Since he has a low level of male sex hormones he doesn’t care that much about sex and undoubtedly he’ll never push himself to get over this problem. So if you want some more intimacy, don’t write to me about it, or complain to anyone, but instead do something, since there is a clear path to follow. Now perhaps there’s nothing that can be done but that’s not what you’ve been told, so drag him by the scruff of the neck and get the answer. Hopefully he can be given testosterone and that will kick start his sex drive. If that’s not possible, then you have two choices: stay with him in a sexless relationship or move on. But you’re not at the stage yet so get going, today!