It should be attached to about two feet of sterile clear plastic tubing, which should be primed with sterile isotonic saline. Wash the penis with a strong antiseptic. Put on a condom. The condom should be filled with sterile isotonic saline as you put it on, and should have the other end of the clear plastic tubing running down its length on the interior to the reservoir tip. Make certain there are no air bubbles in the condom or the clear plastic tubing.
Bubbles can cause air embolism, necrosis, and permanent loss of sexual function.
When you reach orgasm, the fluids will be pumped back into the prostate and endlessly recycled. The orgasm and ejaculation will continue indefinitely. The only limit is when you need to urinate, since that isn't possible during ejaculation. Or when your partner gets bored. To terminate, simply unplug the plastic tubing at either end.