Ok, it's very simple. If you see a post, and there are no replies, or for the sake of argument, less than 3 replies, then it's a guy.
If you see a post with 83,000 replies, then it's a girl. Usually a lesbian or a girl looking for f/f fun. Or a guy pretending to be the former or latter. But anyway, let us assume it is genuine. Many replies will be from guys so desperate to talk to someone who might be a female that they will make the very socially awkward jokes that keep them from ever, ever meeting a real woman in the real world. They will laugh or joke about it, and will die before admitting they themselves are the inept self-centered person keeping all the actual girls from timidly posting.
A step up from that are the many (and it saddens me how many of these there are) lesbian twin sisters who coincidentally have the exact same fetish as their brother. (Why this site does not do more ISP cross-checking, I don't know.) This will only have a few posts, though, as they quickly find some other lesbian into sports, wrestling, and cars that they can go play with.
I do not actually know why the male-female ratio of this particular fetish is the way it is. But I would estimate that it is 99 to 1. So, good luck to you.