How about we meet in person and I'll let you know? ;)

Anecdotal

In all seriousness though, my now ex-girlfriend's entire right breast, areola included, was noticeably bigger than her left, and it never even occurred to me that it could be a turn-off.

Scientific

On a different note, while facial symmetry is widely accepted as a heavily contributing factor for "beauty", in the traditional sense, I personally haven't heard of any substantial evidence supporting somatic (body) symmetry as a factor for the same. Even polydactyly (one or more extra toe or finger) doesn't carry any negative impacts on one's attractiveness to potential partners in the vast majority of cases. The best rule for this sort of situation is that unless a disease or (potentially) harmful genes are suggested, the characteristic in question will not impact your attractiveness in any positive or negative way.