I love how this is a perfectly valid question given the context .. even if the phrasing may be somewhat off.

Back to topic, I'd think boobs (and other parts of the body that aren't part of the face) won't have much impact on prefrences.

Would you really reject someone because of their cup size, despite their pretty face? Similary, would you accept someone just because of their cup size despite their less-than-pretty face?

I mean sure there are people out there for whom this may be a valid concern, but it won't for the vast majority. So the question then really only is where you draw the line - what about asymmetric boobs and other body features?