I suppose small breasts can be ignored if the woman has a nice small waist and bigger hips to create feminine curve. If the girl has small breast with slender hips most of the time I find her very boyish looking.
Small breasts, nice narrow waist & hips that are wider than waist but not over sized looking for build of girls proportions
My wife has an aa-cup that I like very much (although I'm a butt man - she has a wonderfull ass too). Even after 2 pregnancies (and breast feeding) they're still perky. Sometimes it's an advantage to have small breasts (no back pains, bra are optional, less influence from gravity, ... ), just for buying clothes it can be a bit difficult because a lot of clothes are made for cleavage or the curves of a B/C-cup. If you like small breasts => google a video from Howard Stern with sexy flat chested girls ... really hot.
I don't understand why I have encountered so many women that are insecure about being small chested. Considering men and the media find women with small breasts more attractive than their counterparts, why in the world are so many women insecure about their small breasts. It just doesn't make sense. You're already approved by men and the media, what more do you want? Is it becuase you're not glorified in porn? Because that is really the only place where large breasts are a plus, and it's not even large, real breasts. Because large, real breasts don't look like they do in porn videos. I don't know. All I know is that thank goodness I'm average. I'm already insecure about enough, I can't be all like, "Woe is me I have small breasts" or "Woe is me I have large breasts". The way I see it is at least you have boobies. Get cancer and lose your breasts, that probably would be a lot worse. Just saying.