Just personal taste I guess. All sizes and all flavors will have some type of appeal to different people. And that's the way it should be.
From a lesbian point of view *and I'm not a lesbian, but if I were.. * I find the strong, dominant look very attractive. The powerful, masculine look while still being very feminine *if that makes sense* is hot.
I'm not sure what it is about her that attracts her to males though.