I bought a Vitatronic TENS device with the following technical data.
Output voltage: open circuit 0 to 80 V.
With terminating resistor 500 Ohm
Pulse amplitude: measured at a terminating resistor 500 Ohm; 0 to 90 mA
(max. output)
Frequency: 1-250 Hz
With this device I manage to trigger an orgasm.
I attach one electrode under the foreskin where my frenulum was (or I insert a Hegar dilator 13 mm, 19 cm into the urethra), and I insert the other electrode, isolated except for the front, into the anus. With this arrangement I can optimally stimulate the prostate.
I made the electrode for the prostate myself from a caipirinja ice mortar made of metal, 20 cm long. For this purpose I insulated the upper thin end with insulating tape so that only the thick front side is uninsulated. This end is then pushed into the anus to the prostate.
By the way, the polarity can be chosen by feeling. Personally, I have achieved good results by reversing + - (polarity) during a season.
Just try it out.
By the way, my sperm only runs out with almost no orgasm anyway, but that seems normal at 75 years of age and 27,648 masturbations.