I learned how to edge in my mid twenties. A good friend who was an edger taught me and it took a year to master. The point was and is to enjoy masturbation long term because once ejaculation occurs desire drops suddenly. Not with edging regarding ejaculation on the third day it extends with a slower drop off. Now I am 74 and still edge an hour or two a day. My PSA is normal no enlarged prostate no issues. So like they say use it or lose it. And my tests have been recent. Edging is not for everyone. It's a desire to enjoy masturbation at a different level every day and experience intense pleasure long term.
I do use some products from Oxballs combination cock ring and ball extender not the extreme types though. With edging it's important to prevent the balls to retract which signals imminent ejaculation. I can ejaculate with it but it helps with control which I have but it can get exciting. The cock ring helps with the erection. I have no problem with erection if I'm in a situation which is very exciting, like being watched it with feet.
If you go to Oxballs site click enter click cock rings all styles scroll down to 8 ball cock ring and ball sling and grip padded cock ring those are my favorites. They do have strong cock rings as well. I'm not partial to extreme types.