My current wife has been with black guys and said they were in the "average" range. My ex-wife, on the other hand, was a medical assistant and assisted with countless vasectomies, shaving and "taping". She told me that the typical stereotypes were wrong as a whole from what she could tell, except that the biggest she ever saw was, in fact, a black man. Other than him, big was big and small was small, regardless of color.