Penis size is determined by hormone exposure and varies greatly from one individual to the next. The average length of a.
Human penises vary in size on a number of measures, including length and circumference . In humans, the AR gene located on the X chromosome at Xq12 which may determine the penis size. The SRY gene located on the Y chromosome.
Penis size is determined by a variety of factors — the biggest being human genetics, which can produce incredibly varied, sometimes curious.