Well there are risks with everything.
"You might want to visit a urologist and consult on this issue for additional information"
The urologists I have consulted since I have MS (Multipel Skleros) and followed by that ED and los of sensations they all say, prostate massager as Aneros or similiar and also Estim, plug in the butt and a base ring round the base of the shaft can help me out.
What that doctor is answering is written 2009. Alot have changed since that in medical science and diseases.
But like everyting else in the body, if you are to hard with your self, ofc you will damage your self. But there have been and is so much negative talk about a mans pleasure regarding the prostate, its dangerous, dont do it!!!!! The last two years have been a turning point and its more open now and more acceptable to talk about and to explore the pleasure of the prostate.
A good example is:
Doctors, they were certain that the G-spot, well it didnt really exixsted and that a woman couldnt achieve multiple orgasm by stimulating the so called "G-spot". That was a fenomenon and bogus. Well we really laugh at it today. The doctors was wrong, and it really isnt that long ago, 30 years I think. Still they thought women was making it up.
The same goes for the prostate, like that doctor and other doctors. Its dangerous, but it isnt. if you dont have problem with your prostate, then its not safe. They are right about that. But the same goes for a simple damaged muscle, if its damaged, let it rest. If you still goes on, well it might be worse, common sense.
Estim in the butt and genitals, cant do that. That is dangerous!!! Thats is what the said before. It isnt as long its made in the right way and with a known commersial product. That was taboo a couple of years ago. It isnt today, why?
Medical science treatment, You use tens at muscles, no different on the genitals. The difference is the wave patterns and how they is stimulating the nerves.
And here we land at the subject, "prostate massage"
Both as pleasure and treatment.
ED: The natural treatment is to stimulate the prostate by either deep breathing or for example a prostate stimulant as Aneros, or both ( if you dont have problems with your prostate). That will send a signal to your brain and back again and hopefully it will start a deeper stimulation that will cause blood flow to the penis, hopefully arousement etc be the next step.
Next is Estim.