When Karma was still active in the business (Hi Karma!) she recommended the Aneros prostate massager to me but I never tried it.
http://www.aneros.com/
The company's other product
http://www.highisland.com/hemorrhoid-massage-treatment/
is interesting too. I don't know if it works but there is not much in way of do it yourself therapy for consequence of too many decades in a desk chair.
Thanks for the link.