Artman,
First off, thanks for your input and welcome to the Gym!!! Good first post!
Interesting concept and idea! From my research and understanding I believe that the smooth muscle growth than happens in the corpus cavernosa is a result of stress being placed on the cavernous tissues from increased (blood) pressure; either in volume, duration or both. In this hyper-stressed environment the body chemically stimulates a growth response to compensate for this change. It's similar to the body's ability to generate natural cardiac bypasses in persons with blockages (angiogenesis.)
It's hard to say whether or not the SM contractions stimulated by a TENS device would have the same effect. Are you speculating that the smooth muscle would contract the same way skeletal muscle would or is this supported by the studies you mentioned? Either way I would be interesting in reading them if you could post the link.
Thanks again and welcome aboard!!!
-Iguana
Thanks for the welcome! Here is a link that I have read. That's pointing me in this direction.
SpringerLink - Journal Article
C. G. Stief1

, E. Weller2, T. Noack3, M. Djamilian1, M. Meschi1, M. Truss1 and U. Jonas1
(1) Department of Urology, Medizinische Hochschule Hannover, D-30623 Hannover, Germany(2) Department of Physical Medicine and Rehabilitation, Medizinische Hochschule Hannover, D-30623 Hannover, Germany(3) Department of Physiology, University of Marburg, Marburg, Germany
Summary Transcutaneous application of low-frequency electric current in the treatment of partially or temporarily denervated striated muscles is widely used to prevent or treat muscular atrophy. Due to the high regenerative capacity of smooth-muscle cells, this approach should be beneficial in the treatment of diseases with smooth-muscle degeneration due to partial denervation. Our study was done to evaluate the possible beneficial effect of transcutaneously applied low-frequency electric current on the corpus cavernosum penis in the treatment of erectile dysfunction. After a comprehensive workup, 21 patients with chronic erectile dysfunction (20/21 vasoactive nonresponders) received daily (3–5×20 min) transcutaneous functional electromyostimulation of the corpus cavernosum smooth muscles [FEMCC; zero-line symmetric impulses of trapezoid shape, 2-channel device with alternating stimulations; frequency (
f), 10–20 Hz for channel I and 20–35 Hz for channel II; impulse duration (
t i ), 100–150
s; approx. 12 mA; rise time, 0.5 s; stimulation time, 5 s/channel; pause between stimulations, 0.5 s. In all, 4/21 patients (19%) regained full spontaneous erections and another 3/21 (14%) responded to vasoactive drugs after FEMCC. Overall, 14/21 were FEMCC failures, including 2 who subjectively
improved.
In a similar group of patients who were evaluated during the same period but received no therapy, no spontaneous improvement in erectile functïon was observed. Our preliminary findings suggest that FEMCC is feasible and results in an improvement in erectile capacity in a significant number (33%) of patients. Further studies will be carried out to corroborate our results, to improve the stimulation parameters, and to evaluate the selection criteria for patients suitable for FEMCC.