First of all, I wouldn't ever get "married", I'll spend the rest of my life with them, but the government has nothing to do with marraige.

Secondly, it's extremely easy to tell with a transvestite, unless you're real drunk and don't have a clue what you're doing. By the time it came around to "that" time a night, there would be no question in one's mind.
Hypothetically, if I really didn't know and fell in love with them...then it would be over immediately. I wouldn't say much probably, I'd just be kind and explain to them I can't do that, and I have many reasons.