‘A half-century of science has discovered the protean nature of sex, gender and desire.’ Photograph: Neil Constantine/NurPhoto/Shutterstock Last week, the US supreme court ruled that states may restrict participation in girls’ and women’s sports to “biological females” and exclude transgender athletes from competing. In the past six years, 27 states have enacted such bans; before the court were challenges to West Virginia’s Save Women’s Sports Act and Idaho’s Fairness in Women’s Sports Act.