>>781670I remember seeing that on House; it's also called complete androgen insensitivity syndrome. Bascially, all humans start off as female fetuses until hormones start kicking in for males. XY fetuses with the aforementioned syndrome have testes, but the rest of their bodies don't respond to male hormones, thus retaining a feminine appearance. If you remember what you read correctly, though, then those novels are BS, because in real life Sadako would be sterile, unable to bear OR sire children.
Eh, screw it, let's just say she's a normal XX girl. The Ring is weird enough as it is, and I just want some cuteness.