Buck Angel is a biological woman who looks like like a bald muscle dude. I dont think anyone is so straight that would find him/her more attractive than a passable trans just because Buck Angel has a vagina. Its all big and hairy and he / she just looks like a hairy man with a swollen, angry vagina. So swap out Buck Angel for the femboy, would somone still be be straight for jacking off to Buck Angel? Technically a woman with a vagina, but is bald and muscular with no breasts, a beard and body hair? Whats more gay, liking a woman who looks like a man or liking a man who looks like a woman? Its easy to say that liking a man is always gay but if you think a man looks like a woman is that still gay when what you like is the femineine and not the masculaine? Is it not gay to find what looks like a man attractive, even if they look like a man but are a woman?
Ultimately, i dont think anyone can actually can tell you if you are gay or not (except Ice T if you know the meme), if you generally like women I think you are straight. I mean if you fucked 10 women and 1 guy does that mean you are gay? Maybe a bit fruity but if you swap it round and a gay guy fucks 10 men and 1 woman he isnt suddenly straight due to fucking 1 woman. I'm straight btw and have not had sex with another man so this is all guess work and not based on my real life