If they are secure & happy, and had the gumption & fortitude to get what they needed, i would admire & applaud them. I would only date them if they liked to dance!

If the person wasn't above board about gender before the first date, it would be a deal breaker. Not because of the gender thing, but because of the honesty thing.

Trans-men ARE men, and trans-women ARE women. I'm a firm believer in standing up for the LGBTQ+ community despite not really belonging to it. I'm mostly attracted to both femininity and personality. If a person I have a crush on is a transwoman then it wouldn't matter. Besides, it's(in my opinion) usually apparent anyway.

As long as one is not a super selling religious sort, I'm open to all.

Can't choose both? I currently think most (sexually) about people with male parts, but I'm pretty open minded. No one is completely out of bounds based on sex or gender identity.

I seem to like my penis being the only one in the relationship. I'm not exactly sure where that puts me but sexually speaking that's apparently my line.

Interesting question. As they say; "Timing is everything". I'd be curious to know, when would this conversation normally take place? First date?
I have a bit of a background in physical anthropology and I think I could "suspect" something from skull structure, and other sex differences in muscle and bone ratios. But I've seen some transsexuals who I'd not have guessed were a sex other than they portrayed.