https://wecanalwaystell.com/
This is an online game where you attempt to guess the sex of a possible tranny. I got 65%. Only slightly above chance lol. Some of them are pretty hard. You get 30s on each image but I did each one in under 5s. I reckon slowing down and paying more attention to the brow ridge and hairline would make it easier. Seeing other people around them would make it easier for the contrast too.