Go on YouTube and Kathy Love has videos of sexing corns by popping when they are young. She also shows how to sex them with probes. But not everyone has probes or is confident enough to use them. Believe it or not, my vet was afraid of snakes, but would do fecal sample tests, as long as I left the snake outside and showed it to her through the window. Since I moved I have a new vet and he will handle my snakes if necessary.