metta8 saidI was just curious if someone is attracted to both sexes, would they be attracted to someone with a mix of features..... ;)
I'd sometimes refer to my bi guy as my tri guy as he liked guys, women and trans guys. I don't recall him ever playing with a f to m though I did myself, years after I lost him, while playing around one night (we never got all the way, um, down to it, but at least with clothing on, the guy?--sorry, I don't even know the politically correct way to say that--was super hot).
And now one of my friends from grade school, a guy who identifies and lives as str8, has recently become interested in transsexuals m to f and transvestites. He sent me some link about Thai ladyboys.
So from my personal experience and from what I've observed, seems to me the more typical trisexual is not so much attracted to f to m transitioning. I don't have anything scientific to back that up, of course, but from both my experience and for whatever reason my gut instinct, I suspect that might be about the toughest category to match up.