本文结合马文·哈里斯的文化唯物主义的相关理论,从基础结构着手,深入探讨了20世纪20年代美国性伦理变迁的技术、工商业、居住环境和人口因素。认为基础结构的变化最终概然地决定了性伦理的嬗变,从客位的文化唯物主义角度指出了美国新时代性伦理产生的必然性。 Based on the relevant theories of Marvin Harris’ cultural materialism, this dissertation starts from the basic structure and explores the technical, commercial and industrial, residential and demographic factors of American sexual ethic changes in the 1920s. It is concluded that the change of the basic structure ultimately determines the transmutation of sexual ethics and points out the inevitability of the ethical ethics of the new era in the United States from the perspective of cultural materialism in the audience.