There is a manga on this subject, pretty funny too. Forgot the title, its quite old, I think its call Family Compo by Tsukasa Hojo (author of City Hunter, if that mean anything to you), I don't know if they've brought it over to the west, though.
I seem to remember that there was the story of such an event in the UK tabloid press earlier this year i.e. two transexuals marrying each other - most peculiar!
My sister has a friend who is a female-male transexual - s/he(?) has just fallen in love with a man, however, which makes things a bit complicated!