I've run into a few in the last couple of years. Even after talking to them for a while I'm not completely sure. Once I notice smaller hands I decide that this is a GG I'm talking to.
Decades ago there was a beautiful, tall black woman that was a regular at a hotel bar where our band played. At that time I had zero exposure to CDs, but her height and my imagination had me thinking she might not be a genetic, genuine girl. Our bass player told me she wasn't "a guy", and he came from a bigger city where he had been around CDs enough to know. Nevertheless, I approached her one night and said "you sure are tall". Her reply was "you're short"! Coincidently, I went out with her friend for a little while, not knowing they were friends.
Last year I met a couple of CDs (or TS) that were very passable as women and once again I was confused for at least a few minutes. Anyone else?