it's in the "look", but you guys are generalizing it. gaydar works in several ways
a.) for identification, no more, just if you are or not.
b.) for relationship, only gays know this look, few females know this "look"
c.) for sex, this is the one that str8 males can "feel" the odd feeling you get when you get stared up and down. know this, many times you are just a fantasy and not real game. get over yourself. it's like you staring at Angelina Jolie. never gonna happen and you know it. same for us, we know it's never gonna happen but nice to look and dream right?
d.) remember that you are not adonis and not every gay guys finds you attractive for sex or a relationship. even gays discriminate intensely.
we all have our "types" that we find attractive. just cause you got a dick does not mean we are interested in you. (think of you and,,,) fat chick, old chick, bitch chick, slut chick, ugly chick, same thing.