"Those two influential organizations have spent a half-century vigorously policing gender boundaries. Their rationale for decades was to catch male athletes masquerading as women, though they never once discovered an impostor. Instead, the athletes snagged in those efforts have been intersex women — scores of them. The treatment of female athletes, and intersex women in particular, has a long and sordid history. For centuries, sport was the exclusive province of males, the competitive arena where masculinity was cultivated and proven. Sport endowed men with the physical and psychological strength that 'manhood' required. As women in the late 19th century encroached on explicitly male domains — sport, education, paid labor — many in society became increasingly anxious; if a woman’s place wasn’t immutable, maybe a man’s role, and the power it entailed, were not secure either...."
From "The Humiliating Practice of Sex-Testing Female Athletes/For years, international sports organizations have been policing women for “masculine” qualities — and turning their Olympic dreams into nightmares. But when Dutee Chand appealed her ban, she may have changed the rules." in The NYT.