Testosterone is primarily made in the testes, and creates many of the characteristics we see in adult men. from www.shutterstock.com

You need more than just testes to make a penis

Disorders affecting penis development are among the most common birth defects seen in humans, and rates are on the rise.

Contact Mark for

  • General
  • Media request
  • Speaking request
  • Consulting / Advising
  • Research collaboration
  • Research supervision