The scientific literature concerning electroejaculation of simian primates contains many reports of successful collection of seminal fluid through electrostimulation with penile and rectal electrodes. In none of these reports is there a sufficient discussion of the important electrical parameters involved, such as the amplitude and density of electric current and the impedance of the electrode/tissue interface. Without such information it is difficult, if not impossible, for investigators in other laboratories to duplicate the stimulation regimen successfully and without injury to the animal. This assumes even greater importance when such techniques are considered for application to human beings.