Lonzi's most significant works include Autoritratto ("Self-Portrait", 1969); "Writings on Art" (1970); Manifesto di Rivolta femminile ("Manifesto of the Feminine Revolt", 1970); Sputiamo su Hegel, La donna clitoridea e la donna vaginale e altri scritti ("Let's Spit on Hegel,[1] The Clitoridian Woman and the Vaginal Woman, and Other Writings", 1974); and "Diary of a Feminist" (1977).

Her father owned a small industrial company and her mother dedicated her life to the nurture and education of Lonzi and her four siblings.

Autorittrato reworked the role and identity of the art critic[2] by deploying a style of writing revolving around subjectivity and discussion.

Further, Lonzi strayed from the most traditional use of photography, using caption-less, black and white, personal photos of the artists instead of images of their work.

Most importantly, Autorittrato revealed Lonzi's theory of creative subjectivity, one which aims to deconstruct patriarchal concepts such as individuality.

The artists featured in Autorittrato were: Lucio Fontana, Jannis Kounellis, Luciano Fabro, Pino Pascali, Giulio Paolini, Mimmo Rotella, Carla Accardi (the only female artist), Getulio Alviani, Enrico Castellani, Mario Nigro, Salvatore Scarpitta, Giulio Turcato, Cy Twombly and Pietro Consagra.

Most of the ideas expressed in the book are gathered from information collected from periodicals, exhibition catalogues, conference papers, and newspaper essays.

[4] She had grown to view art as being yet another part of a system of institutions and labour which enable unequal power relations and the overall oppression of women.

[4] In 1970 Lonzi, Carla Accardi, and Elvira Banotti founded Rivolta Femminile, an Italian feminist collective.

[3] Some of Lonzi's most notable works from this period include "The Clitoral and the Vaginal Woman", "Let's spit on Hegel", and "Diary of a Feminist".

The Diary largely chronicles Lonzi's social experiments with relationships, as well as an exploration of female sexuality and a pursuit of truth.

Published at a time when women's sexuality and self-liberation were at the forefront of feminist discussion, the book significantly contributed to these debates.