Well, imo, that's a small(er) issue. I think that NC took this stance because of stories like I just posted. But I dunno, I can't speak for NC.
There are also stories of "transgendered" people who are attracted to both sexes, who demand access to the bathroom they want access too. There are just far too many potential abuses here, though I *think* the "sex you were born with" might go too far for someone who has had sex re-assignment.