乳房是成年女性显著的性特征。丰满的乳房具有特有的柔美曲线,能充分显示出女性体型的曲线美。因此,拥有丰满、挺拔的胸部,是现代女性的追求。然而,早在我国宋代,统治者以理学作为统治思想,以“存天理灭人欲”为名,对妇女严加管束。两宋以降,更提倡女性束胸,以天乳为丑。于是,女性们纷纷把乳房用紧身褡或小背心强压下去, Breast is a significant feature of adult women. Full breasts have a unique soft curve, can fully show the curvaceous shape of the female body. Therefore, with full, straight chest, is the pursuit of modern women. However, as early as the Song Dynasty in our country, the rulers took the rationalism as the ruling thought and the name of “save the natural person and desire humanity”, which strictly controlled the women. Two Songs to decline, but also to promote women’s breast-busting, to milk as ugly. As a result, women have the breasts with tight 褡 or a small vest forced down,