In this week’s issue, Andrea Long Chu makes a case for the right of anybody, at any age, to change their sex. Chu argues that the left hasn’t yet presented a coherent account of why one’s gender identity should necessitate biological intervention. Sex is real, she says, but “the belief that we have a moral duty to accept reality just because it is real is, I think, a fine definition of nihilism.” In this way, freedom of sex is an issue of biological justice. “What is new is the idea that this freedom can be asserted as a universal right by a group as politically disenfranchised as the young,” Chu writes. “This is why the anti-trans movement is so desperate: It is afraid of what sex might become.”