"Sexual Treason in Germany during the First World War" is a comprehensive study of sexual lifestyles in Germany and occupied Europe during World War I. The book highlights the often-overlooked characters of this era, including widowed women who worked as prostitutes, soldiers treated in venereal disease hospitals, and eugenic thinkers who linked sexuality to national decline. Lisa M. Todd examines the interactions between public discourse, state policy, and everyday life to expand the understanding of war and society in the 20th century. By placing the experiences from 1914 to 1918 in the context of the preceding sexual reform movement and the subsequent Allied occupation of the Rhineland, the impact of the war years on the history of intimate relationships in early 20th-century Germany is thoroughly assessed.