While doctors disagree and might give opinions different from these opinions, these are great, well-presented explanations of the conditions. They also explain various surgical and non-surgical treatments. They are a good education for new members and veterans alike.
https://www.youtube.com/watch?v=5CJBDBIAy90 Jesse Mills, MD, Director of the Men's Clinic at UCLA
https://www.youtube.com/watch?v=vCtQTQ-l_bA Culley C. Carson III, MD, Professor Emeritus at the University of North Carolina School of Medicine,