I agree with PrimerMan on the handheld shower. I have a WaterPik, but I know the Grothe (?) are very good. With a fairly low flow, pretty warm, and just the regular spray it is an absolute scream when I do my cock and balls. Be sure and don't even touch them before you try. And, as he says, having a bag flowing while you do this is pure heaven. One bit of advice, which you are sure to find out when you try it, is to not use the massage feature. It will just about kill your balls, as it is too strong.
However, according to my ex-wife, the massage is super for the gals.
Try this -- you'll like it!