And finally... a lawyer. Because so many of the problems trans and intersex people face are due to them not fitting the unchangeable, strict binary definition of sex in the eyes of the law.
Weiss, J.T. (2009). Transgender Identity, Textualism, and the Supreme Court: What Is the "Plain Meaning" of "Sex" in Title VII of The Civil Rights Act of 1964? Temple Political and Civil Rights Law Review, 18, 573-649.
In which are quoted, inter alia, Sigmund Freud, Judith Butler, Thomas More, and Sherlock Holmes. (OK, Sir Arthur Conan-Doyle if you want to be picky).
Abstract: The Supreme Court, if it is true to conservative "textualist" jurisprudence, will recognize that the prohibition of sex discrimination in the Civil Rights Act of 1964 covers discrimination against transgender persons.
This one's worth reading as an "Interesting URL" in its own right.