For me, I suppose, they have to look more (almost extremely) womanly and feminine. If they have facial structures that are obviously male, then, nope! To use some examples here: Chulin? Hmmm...okay, sure. May? Absolutely not! Not only do I just straight up see a man but that second GIF reminds me too much of >>>No real gay guy ever watches newhalfs. Have you seen actual gay porn? Ultra masculine men only. Trans porn has almost exclusively a straight male audience.
That's why the Kinsey scale has 7 categories. It's not a black vs. white thing.
Edit: Btw, I think most people here pretty open and aware about their sexuality. They don't need any lecture or condescension.