hoddle10,
Not disagreeing. And many of the studies done, albeit their scarcity, are generally done by those seeking financial reward and thus results have the potential to be skewed towards a favorable outcome.
Still, the issue is an important one. Female cosmetic surgery is a very profitable business. Breast, cheek, buttock augmentation is a billion dollar business. Companies and physicians make money hand over fist. And like it or not, financial incentives are a major factor in developing new technologies and procedures. It warrants the thought then that investing in the development of penile augmentation procedures would eventually lead to a substantial return on investment.
So that leaves the following thought: All current research and experimentation on penile augmentation done my medical companies and physicians has resulted in less than satisfactory outcomes. I hardly doubt these particular entities have completely ignored penile enhancement. Probably most men worry about their size and thousands of polls indicate that a vast number are unhappy with their member. Companies are not stupid and know that if a technique could be developed to successfully treat these men, there would be a massive profit to be had.
Based on what I believe to be a reasonable assumption then, the only answer at this point is that no clinically tested procedure has been developed or discovered to successfully and safely enlarge, enhance, or augment the human penis with consistent positive results.