Even though there really isnt anything that would excuse the dickheaded-ness implicit in this poll, its customary to include some background such as, say, how long you have been dating the PERSON that this thread refers to.
If you really cant accept her as she is, and you arent firing reasonably well on all cylinders in the other areas (non-physical areas) of the relationship, dumping her would be kinder than saying "I just cant date you unless you get your tits lifted"