I used to have a really good method ofr spotting gay men. They were the ones trying to chat me up in bars... Seriously, I used to get hit on a lot despite not being gay (and no, I am neither confused nor homophobic... I have dabbled and know from experience I get no feelings at all from gay activities). Maybe I send out confusing signals

And, of course, all men have a surefire way of spotting lesbians. Surely it is any women who refuses to sleep with them?
[And no, before I get flamed, I am not in anyway serious about that comment...]