Is a man fucking a transwoman, or a woman fucking a transman, a homosexual act? Is a woman a woman if she says thinks and acts like she is?

To clarify, for sake of discussion, I do mean full on trans, so a transwoman does not have a cock, and a transman does not have a pussy. They effectively look like women and men, at least without seeing their nether regions.

Here's an example of a transwoman. Somewhat NSFW. Link.

Here's a transman. Somewhat NSFW. Link

So,

Is a man fucking a transwoman, or a woman fucking a transman, a homosexual act?

Is a woman a woman if she says thinks and acts like she is?

Looks like a woman but with a male brain, many a TRPer allude to such desire.