I've been "dating" since I was 14, and every single one, except for 1, was straight 100%. Not to yank my own chain, but I'm speaking 30+ in 10 years. Of course, I didn't sleep with all of them, not even half, but most have been sexual relationships. I have plenty of straight female friends, who also, would have no problem dating a f2m. You'd be surprised how much women are more interested in that emotional thing. Yes, sexual chemistry is a must, but you can find that, and learn what each other likes/dislikes, is comfortable with, and whatnot down the road. I'll also add, I'm 100% hetro, and "we" carry on a hetro relationship. And only tell those, who we are close to.
As far as the whole gay relationship thing. I have to back up Mister. I also get hit on quite a bit by gay men, who clearly know I'm f2m, because I tell them off the bat "I'm not what you're looking for". And make it CLEAR I don't have the right equipment, biologically at least. And they still, push on. Which has lead to me having to be down right rude, to get the point across on a few occasions. I also live in the bay area though, so I can only speak for around here.