My ex girlfriend had FF breasts and, you guessed it, they got glanced at no matter what she wore.
Now, one important thing I have noticed, even heterosexual girls will stare down the cleavage of a well-endowed girl if she's got them on display. I've done it with women I'm not particularly attracted to. Maybe it's because you know you're not supposed to look, maybe it's psychological because you're not supposed to see it, but both men and women of any sexuality stare down the tops of women exposing a lot.
Also, I've noticed way too many women with large breasts try and make it their identity. The amount of times women have told me "No, it's fine. You can touch my boob if you want, I don't mind." I don't care! A boob is a boob is a boob! I've felt them before, yours aren't that special, now let me get drunk and shout happily at people! >.<