Introduction -- The two genders -- Thirty-seven words -- No bow lesbo -- The runner in South Africa -- It's biology, and we can't change that -- The wrestler -- The runners in Connecticut -- The breakup in women's sports -- The quest to save women's sports -- The case of Lia Thomas -- Why aren't we talking about transgender men? -- The answers to the questions I'm always asked -- The future of policy -- Epilogue: The march toward restriction.