By the way, Danny
It's actually EASIEST to sex corns when they are hatchlings, either with popping or probing. The Cornsnake Manual, which I hope is on your Christmas list, has great photos of snake's vents to illustrate the difference. All mine are "down" for their winter nap right now, but I'll sneak in a photo or two next time I check on them if no one else has by then.
Merry Christmas