The action resulted in Viloria being invited to participate in the International Olympic Committee's October 2010 meeting of experts on intersex women in sports, in Lausanne, Switzerland, where she lobbied against adopting regulations which require intersex female athletes to undergo medically unnecessary medical procedures in order to compete as women, and against athletes being referred to as individuals with "disorders of sex development". As a result of Viloria's advocacy, the IOC and IAAF discontinued its use of "disorders of sex development" to describe the athletes in question, and replaced it with "women with hyperandrogenism". Viloria has argued since 2009 that Olympic sex testing is applied in a way that targets 'butch,' or masculine-looking, women. In 2012, Viloria co-authored an article in the American Journal of Bioethics, with intersex Spanish hurdler Maria José Martínez-Patiño, the athlete responsible for overturning the IOC's long-standing mandatory chromosome testing policies, which critiqued the IOC's proposed regulations for women with high levels of naturally occurring testosterone (aka hyperandrogenism). Upon the release of the I.O.C.'s final regulations for intersex women with hyperandrogenism in 2012, s/he collaborated on an opinion piece with scholar Georgiann Davis and also told "The New York Times" that the issues for intersex athletes remain unresolved: "Many athletes have medical differences that give them a competitive edge but are not asked to have medical interventions to 'remove' the advantage... The real issue is not fairness, but that certain athletes are not accepted as real women because of their appearance." On Human Rights Day, 2013, Viloria became the first openly intersex person to speak at the U.N., by invitation, at the event "Sport Comes Out Against Homophobia", along with fellow "out" pioneers, tennis legend Martina Navratilova, and NBA player Jason Collins. In 2014, Viloria advocated against the IOC and IAAF's regulations for women with hyperandrogenism on a panel on the Aljazeera television show "The Stream". She also wrote about the interphobia and common misunderstandings around naturally occurring testosterone which drive sporting regulations for intersex women, in "The Advocate". With the advent of a new German law assigning visibly intersex infants to an 'indeterminate' gender, Viloria has argued that this approach to birth registrations fails to provide adequate human rights for intersex people, and fails to address the most critical need: for an end to normalizing surgical and hormonal interventions on infants and children.