hey. i found this article quite interesting (admittedly it is more about gender than sex):

http://en.wikipedia.org/wiki/Third_gender

the idea, however... is that current sex 'options':
male
female
are inadequate for quite a few contemporary societies.

sometimes suggested other options are around social role...
but sometimes they are around physical characteristics as well...

i would imagine that it would be EXTREMELY controversial whether to describe people of the 'third sex' as 'defective males' or 'defective females'. all part of the bell curve and normal human variation and all (and our irresistable urge to put people into nice and neat little boxes).

have you seen a doctor about your concern?

(i'm wondering because quite often people get to wondering whether they are really of the other sex... it is something i've wondered about myself at times too...)