A majority of males are perverts. If big boobs sell, then...
harsh. I know there are a lot of female perverts as well.
'sides, its good to be a bit pervy everynow and then
Yup, even girls can become perverts when they decided to go the extra mile in 'skinship'.
Even they talk things like sizes when they are with their friends.
Not only guys adore big boobs but girls as well.
So it's natural for big boobs in anime since both males and females love them
Because 'some' Japanese people (along with people outside the originally intended Japanese Audience) are intense about their perversion for, ('bigger is better'). big boobs.