The book is the outcome of research on the themes of sex, sexuality and performativity which started in summer 2019 and was concluded in autumn 2021. The investigation starts from a curatorial perspective, situated in the field of contemporary Italian visual and performing arts, and evolves by absorbing contents from a variety of disciplines (philosophy, literature, history and pornography). The research is based on the firm conviction – here turned into a method – that a critical theory able to go beyond the disciplinary compartments of knowledge is an important practical tool for facing the political challenges of our contemporary world. The title of the publication, L’Ano Solare (The Solar Anus), is borrowed from the text of the same name by Georges Bataille, theorist of unproductive expenditure, in whose lines we can find the seeds of the concept of anality that we hold dear. The anus – that “protagonist of a political strategy to terrorise and challenge totalitarian heteronormativity”, in the words of ideadestroyingmuros in the introduction to the Italian edition of Terrore Anale (Anal Terror) by Paul B. Preciado – is the sun around which the system of thought that enriches this book revolves.