Has anyone Learned how to Make Their Voice Deeper?

I recently asked my doctor if it was possible to achieve a deeper voice.  His answer to the qestion was something in the line of "maybe, maybe not".  He said it depended on whether there was something that was making my voice higher than it should be like low levels of testosterone.  Apparently if you have low testosterone it can hinder a deep voice.  So I had my testosterone levels tested, and they were in check.  My doctor said I only had two options now, since the testosterone injections were out of the question.  I could either have voice box surgery, or I could take voice lessons to lower my voice.