i have wondered the same thing my son weres disposables to bed every nite and i have noticed testicular growth but it is smaller than his younger brother who has a out grown him very much so and his younger brother does not wet the bed or pee himself during the day so he does not were a diaper but i dont let him were boxers he only ever has worn white undies and he has had no problem he has also ejaqulated too his older brother has not and has not grown in penis size for about two years also his younger brother is only 9 and im worried about him i have brought him to a doctor and the doctor gave him a experimental pill but it does not work at all