By Britni de la Cretaz The testosterone-centered policies used at the Olympics aren’t just about elite sports. They trickle down to even the recreational and youth levels, and end up policing who gets to be a woman in women’s sports—and in society at large. Jenna Weiner started playing ultimate in 2011 as an undergraduate at Cal. She loved chasing down discs on long throws and the beauty and simplicity of seeing them in flight. So in ’16, when she started a graduate program in communication studies at the University of Nevada, Reno, it made sense that the sport she loved would help her find co…