These books may not be the right match for your concerns but it might get you started:
Men's Sexual Health: Fitness for Satisfying Sex, by Barry McCarthy & Michael Metz
These two write solid and reliable books to help men's bodies and men's relationships. While I'm highlighting this one, I trust their writing pretty reliably.
Reclaiming Sex and Intimacy After Prostate Cancer, by Jeff Allbaugh
A great resource for a challenging and complex experience.
Coping with Erectile Dysfunction, by Michael Metz and Barry McCarthy
I couldn't help myself-- here's another one they wrote. I recommend it for all my clients who struggle with ED. It's a workbook, educational manual and coach all in one.