This sounds like bad news for a friend of mine. Her genitals were "misformed" at birth and, despite actually being female (including a vagina, ovaries, etc), the fact she had something resembling a penis at birth she was "identified" as male initially. I guess she would be smart to avoid Nebraska in the future, where it would now be a crime for her to use women's restrooms and changing rooms.
And before someone asks, her birth certificate was corrected -- even as that of many transsexuals ends up being "corrected" -- but the Nebraska law specifically states the sex assigned at birth; likely so that transsexuals who move from other states can't claim to be the opposite sex based on their corrected birth certificates.