I just bought two toulouse goslings from our local trades days, and the guy sexed them for me right there when I picked them out.
He put them between his theighs it's rear facing out and just kind-of un rolled/ folded the vent open. If it's a boy there will be a little curly flesh deal that pops out.
Mine are about 3-4 weeks old though.
No, I know exactly what you are talking about. That's the vent sexing I was referring to. I did that, but I've never done it before, so I don't know that I did it right. I was just wondering if there was another way (physical characteristics and such) that I could tell. Thanks ric.