[The First Aria]

hi, i think the main difference between male and female is in the AR receptor number in breast tissue. Also, hormones play another important role. What is fondamental to development are the ratios: AR/ER, androgen/estrogen. The higher are those numbers, the smaller is your breast

Then why are some of us males, able to get DD size breast's then, while men on mtf are sometimes lucky to get B's? I think it has more to do with your basic genetic makeup. Like, were you developing as a female or male in the womb.