Dotdotcircle, the famed investigateer adamantly believed IUV was a girl. He found records dating back over a decade of it identifying as female, found private yet unsecured medical records tied to it's email address confirming the use of a female-only medication, and a whole bunch of other circumstantial evidence. He never found anything directly conclusive, which means one thing is for sure: IUV has done a damn good job keeping its identity a secret. I'm talking paranoid level.