First off not a Dr, just an old guy who had surgery for prostate cancer.

When a person has a radical proctectomy, there are options. One is non nerve sparing where all of the nerves on the prostate are removed. The second opinion that I received from the Dr at Dana Farber was that he told me he'd only do non nerve sparing.

If they remove the all the nerves you will never have a natural erection again. Then its Trimix or an implant, is my understanding.

I chose the Beth Israel Hospital as they told me they could do nerve sparing but likely only partial. And that's what I have one set of nerves is intact and the other side only half the nerve bundle was saved. I do get nocturnal erections and can get a partial erection but not firm enough for intercourse. Then I rely on Trimix, which for me works well.

The TENS unit pads attach by my ankle. Your PT should be able to show you proper placement on your ankle. I purchased one at Amazon, the Auvon Rechargeable for $29.00, and it works well.

I also use bio-feedback but the unit is in my PT's office.

There's a decent book that helped me a bit -- https://www.ebay.com/p/246975819 "Life After Prostatectomy" .

And I was mostly continent after about 15 months.

Kegels 3-4 times a day, yes there's an app for that.

Good luck and please happy to answer any questions that may help you.

Again just my experience, everyone has different experiences.