I'm picky as it is. As far as what I find attractive, I like blondes, tall, with high, firm breasts and long legs and arms and good abs that's physically active as I am. Getting that alone doesn't really allow me to be as picky as determining, "Well, you have to be born biologically male, or pass..."
And a lot of times, if the girl's pretty, I'm not the best person to guess, and I was raised by the sort of people who urged me not to ask about someone's genitals they were born with on the first night. You know, us southerners are just backwards that way.