Well, I'd never get into that situation in reality. I've never seen a man to woman transformation that I couldn't spot. I'm an extremely observant person when it comes to features, expressions and habits. Women have many subtle cues beyond boobs, pussy and (lack of) body hair that say they're a woman. Eye shape, jaw shape, hips, shoulder ratio, arm motion, Adam's apple (obviously), leg motion, smell... ways of communicating, expressions... they are all distinct and consistent to women and I've never seen a man copy it accurately, regardless of surgery or hormones. Even if in a photo it can be masked, in person it's obvious. A true give away is voice, as a woman's voice is processed by the areas of a man's brain that processes music while a man's voice is understood by the part that handles math. It doesn't matter if it's a high pitched man or low pitched woman.
However, if I were to suspend reality and say that I could be fooled by presentation, I would politely leave the situation. The simple reality is that I want a woman. I want to have kids and a family. The idea of being with a man sexually is gross to me, even if they look like a woman. I would never be able to forget that they were (are?) a man. And I find the idea of surgically messing up a perfectly fine cock to make it look like a vagina seems mentally unhealthy to me, and it won't actually be a real vagina anyway. I'm OK with elective surgery, and I think people should be free to express themselves as their heart desires, but altering your genitalia to make it look like the opposite sex and taking synthetic hormones seems to cross a line of good health for me. I feel someone considering it should be encouraged to be comfortable in their own skin rather than trying to change it.
