I have a transgender friend who is neither XX or XY, but is XXY. That is a natural genetic anomoly.
Oh Jeebus F--k. Conservatives (ok not necessarily all, but) are so concerned about putting us all into little check boxes that have rigid boundaries and insisting there is no other way. This just irritates the heck out of me. And basing it on the BUY-BULL. People are, just let them be who they wanna be. Gender is not rigid, and love who you want to love.