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And AGAIN, absent a medical examination or a sexual encounter, you just can't know that--it's an article of faith for you. Even if you've never been fooled into thinking a man was a woman or a woman was a man, I would venture that that was because you're so paranoid about it that you often mistake regular people who identify with their biological sex as trannies.
Lots of people definitely have been fooled, even if you're not one of them. There are innumerable accounts in the media and on the web of men who thought they were with a woman until the clothes came off.
Your 'proof' that you're always correct is nothing more than your belief that you're always correct. "I can tell" is neither fact nor datum. I can't always tell, at least in casual social settings or media, and it doesn't bother me in the least.
A few generations back, before any of this shit was even in the public consciousness, sexual ambiguity was a well recognized phenomenom and part of popular culture. Remember Pat, on SNL?
It would be interesting to do a line up and have you identify people by their biological sex. I'll bet you wouldn't do nearly as well as you think you would but I would also guess that your bias would be skewed toward identifying people as trannies who are not. Technically, that wouldn't count as anyone fooling you, since no one would have been trying to fool you, but I'd still bet you got it wrong as often as anyone else.