Scholars of academic sport studies have long debated the relationship between sport and gender. Modern sport forms have been shown to have historically supported ideals of male superiority, by largely excluding women and/or celebrating only men's athletic achievements. Sex-integrated sport offers a radical departure from such beliefs, as it challenges us to reject assumptions of male superiority. This book examines international case studies that reaffirm the contemporary relevance of sex integration debates, and articulate the possibility of sport acting as a legitimate space for political struggle, resistance and change. It was originally published as a special issue of Sport in Society.