In chicks, my standards are pretty well impossibly high for a guy of my stature (take that any way you want to). I dig the typical Hollywood beauties like Keira Knightley or Alicia Silverstone (though not so much in her fat phase lol), and typically go for chicks irl who fit that type.
In guys, it really depends. Mostly I like the pretty-boy type, fairly feminine, though not the type who is, for lack of a better term, a "flamer". Overt and over-the-top flamboyancy doesn't do it for me.
And since we seem to be distinguishing between bio- and otherwise, I'm totally into ftms and mtfs, if they pass my likely too-rigorous standards.
SD