Recent research concluded penile tisue might produce testosterone

Researchers have long cited the adrenal glands and testes as the twin engines driving androgen (male hormone) production.

But a team from at Brown University in Providence wondered whether other organs or tissues might be involved. The observation stems from analyses in both mice and human tissue, revealing that proteins key to the production of hormones such as testosterone are active in penile tissue.

This conclusion challenges the current ways of thinking about testosterone production. It goes up against present concept that testosterone production is entirely within the realm of the testes and adrenal glands. And this may be an avenue for further research and investigation.