Gfs, This came to mind, and I asked it, yesterday. I was particularly interested in your answer, but you didn't get back for awhile, so you may have missed it:

What of a person born physically intersexual, who has been surgically conformed to one sex so far as outward appearance and function? Assuming, for the discussion, that the individual is infertile. Should that individual be allowed legal marriage? And if so, to whom?