devilF1sh poses sensible questions and Curtis provides good answers. Trouble is, however, any vasoconstrictor or something messing with the vas deferens, just like many other procedures, can lead to unwanted complications. Haphazard use of any cock ring can create this trouble for the wearer be it auto erotica or even with a knowledgeable partner.

The best rule of thumb is to leave well enough alone, and find many other (healthier) outlets for expressing passion.