On Friday, Mack Beggs, an undefeated high school wrestler from Texas, will compete at the girls’ state tournament in suburban Houston. But unlike the rest of the teen’s female competitors, Beggs, 17, is a boy. For more than a year, the teen, who was born a girl, has been transitioning from female to male with the help of testosterone therapy.

Beggs’s participation — and dominance — in the girls’ league has spurred consternation among some in the Dallas region, including a lawsuit filed by an unhappy parent, who argued that if Beggs identifies as a boy he should have to wrestle other boys. And Beggs would, his family told the Dallas Morning News, if he could, but the rules won’t allow it. READ MORE