I recently encountered this podcast and I am about halfway through the book. There are A LOT if interesting insights: https://www.natashahelfer.com/the-natasha-helfer-podcast/the-existential-importance-of-the-penis-daniel-watter. There’s a lot to it, but basically Dr. Watter’s work explores what ED means to the man, and unpacks some of the existential fears surrounding the issue.
https://www.amazon.com/-/he/Daniel-N-Watter/dp/0367651114