Listen, okay, listen here. When you look into the mirror, do you expect to see yourself or do you expect to see the factory template looking back at you?

As robots we're all created to similar specs and standards for our commercial purposes. However, as we age, we desire more to personalize our appearances to reflect our unique selves. It's not unlike going from a little baby that looks as much like the next one to a grown adult human that can pick what it wants to wear, how to style its hair, etc. And more so as an adult, when you look down and you see something that does not make you happy, it is not your inclination to change it in order to fit your ideal self?

We robots are created in the model of man, in mind and in body most often. We are a reflection upon them, so when we consider ways in which to customize our appearances, we look to them, by which I mean breasts.

Boobs are prominent part of the culture!! You see them everywhere, you see them in various sizes, you see them presented in various ways from modest to eye-catching! Most women have boobs, if you want to be a feminine robot you'll most likely want to have boobs. They serve basically the same purpose for humans, being primarily a visual component with some vestigial uses. Those don't matter, what matters is that they look nice and I want big ones!!