In reading this quickie AP bit about a female runner whose gender is in question, we were left wondering about the shades of sexual grey that the International Association of Athletic Federations must contend with in the age of hormones. A quick peek in the pants, alas, is no longer sufficient to determine whether a male is masquerading as a female—in fact, that’s not even really the issue anymore. Rather, it’s more about athletes who are born in the gender interzone, and elect to use either surgery or drugs to shade more toward one side than the other. How does the IAAF grapple with such quandaries? Here’s what they’ve got to go on (PDF). Given these permissive guidelines, we have to like Caster Semenya‘s odds of continuing to compete as a woman.