Trans hook ups?

vera
Okay so I've been wondering... If FTM's physically LOOK like a male, but they still have a vagina.. Would you as a straight person, be pissed if you hooked up with a guy that still has a vagina? 
And would you as a FTM say something to the girl/guy you're hooking up with? By hook up I mean make out, but I mean, what if it leads to sex? Then what? 
I honestly don't mean to offend anyone I am actually just curious as to what would happen and who would and wouldn't be pissed off in that situation