Introduction : diversity denied -- 1 Sex and diversity -- 2 Sex versus gender -- 3 Sex within bodies -- 4 Sex roles -- 5 Two-gender families -- 6 Multiple-gender families -- 7 Female choice -- 8 Same-sex sexuality -- 9 The theory of evolution -- 10 An embryonic narrative -- 11 Sex determination -- 12 Sex differences -- 13 Gender identity -- 14 Sexual orientation -- 15 Psychological perspectives -- 16 Disease versus diversity -- 17 Genetic engineering versus diversity -- 18 Two-spirits, Mahu, and Hijras -- 19 Transgender in historical Europe and the Middle East -- 20 Sexual relations in antiquity -- 21 Tomboi, Vestidas, And Guevedoche -- 22 Trans politics in the United States -- App Policy recommendations -- Notes -- Index