testosterone does play a key role in developement, i should know i was born with klinefelter syndrome which basically means undeveloped testicles and also micropenis, but i grew up in the country and never went to the doctor, when i was born i was circumcized which i was told later that the doctor strongly was against because he told my mother that my penis was quite a bit undersized , but said that i would probably be fine, my mom wanted me to look like my dad thats what she said to the doctor when he said i shouldn't be circumsized, we were pretty poor so i never went to the doctor really, only for the flu or a bad earache, but i always knew i was seriously undersized even right away in grade school mine didn't look anything like the other boys in gym so i just kinda hid it from everyone the best i could . then we moved to the city when i was about 14 ! then i started to date and by the time i was sixteen i decided i better go to the doctor cause nothin had grown and i still didn't have any hair down there! thats when i found out about my condition, so i had to get testoterone replacement to grow some hair and function normally for sex! oh in case your wondering why i'm even here i just always been envious of guys with big ones and wanted to here what its like to have a big one and read some of the womens experiences to! I haven't posted much cause alot of the topics don't apply to me cause of my size, oh and for the record i was 2 weeks premature , but i doubt that it had anything to do with it