D@mn, poor, poor humans- this two-gender thing has us all so confused...shall I explain?
If you're born XY, you're a boy...except if you're androgen insensitive or fairly certain you're a woman.
If you're born XX, you're a girl- unless you just know you're not.
If you're born XXY, or XXYY, say f~ck it and buy a kilt...
And if your name is Tania, yeh, welcome to the women's locker room...