What does "胸不平何以平天下" mean?

表达自己对妹子胸部的看法 平胸妹的人生哲学 后半句可以接“乳不巨何以聚人心”

ENExpressing one's opinion on a girl's breasts. The life philosophy of a flat-chested girl. The second half of the sentence can be followed by 'If the breasts are not huge, how can one gather people's hearts?'