I do not think so. Gay is for men, you can like dicks and also women. I do not know how a trap feels, but if they say they are women, we can do nothing but trust them.
Those who have made the transsexual transition from man to woman feel feminine and want to be perceived as feminine, so treat them like women. Therefore, it doesn't matter if she has a penis or not - heterosexual drives speak in you, and the penis - well, consider it a fetish.