It must be the hair.

I mean, when you consider comic book characters to potentially transform into women, the Norse god of thunder isn't one that generally leaps to mind. However, considering that Thor likes to wear his blond hair as long and loose as your average shampoo model—earning him the nickname "Goldilocks" from his teammates—I guess he was kind of asking for it.

In this roundup of images featuring the Asgardian amazon, the majority come from an ongoing series of books told in an alternate future of the Marvel universe dubbed "Earth X." It's an epic story being told in three series of books (each about 12-15 books long): Earth X (now in trade paperback form), Universe X (ongoing), and the upcoming Paradise X. When the story started, Thor had already been transformed into a woman, the victim of his crafty brother Loki's schemes...apparently Loki managed to convince Odin that Thor needed another lesson in humility, and turning him into a woman would do the trick. (Little brothers are such a pain.) Unfortunately, since the epic spans the entire Marvel universe, Thor is something of a bit player, and only pops up from time to time.