Conversation so far:
What were the Performative Acts relative to Judith Butler?
In the essay Performative Acts and Gender Constitution, Judith Butler proposes that gender is performative.
Why does Judith Butler argue that gender is performative in the essay Performative Acts and Gender Constitution?
Judith Butler argues that gender is best perceived as performative, which suggests that it has a social audience.

Question: Did she write a book or is this a spoken theory?
Self-contained rewrite: Did Judith Butler write a book or is the notion that gender is performative a spoken theory?