link (http://www.bloomberg.com/apps/news?pid=20601079&sid=aU__Pd3z5.js&refer=home)
``We are delving into the investigation of what is sex, and we are learning it is a far more complex question than we ever imagined,'' says Arne Ljungqvist, 75, a Swedish pathologist on the International Olympic Committee's medical panel.
The Lausanne, Switzerland-based IOC drew up a policy in 2004 that allows ``transitioned'' athletes to compete once they have changed their legal status, had surgery and waited two years to lose the advantages of the sex hormones testosterone or estrogen.