gentics...
back long time ago, they are related (or cousins) to
caucasians..jus tat they have darker skin...therefore it also give
rise to their high nose bridges and deep set eyes...and in tis
case, ur area of interest, boobs...
culture and nurture...
due to the costumes that they wear, they believe that only women w
fleshy bodies look good in saris...
if u have big meaty bods...up (size) goes ur boobs too...