Chunky Stool
Plant Destroyer
Why not just let them watch some raunchy snake porn, then look for boners?Probably not, but I'm going to tell you. I've been dorking out on snakes again lately, forgive me everyone.
It either involves a move called "popping" to evert their hemipenes, (Snakes are rockin' double-dongs, by the way) or inserting a steel probe into a spot in their tails posterior of the vent.
After 25+ years of snake keeping I can tell the gender of most species just by looking at their tail, but that's a Jedi trick, some people develop it, some don't. I can tell the gender of an adult Bull, Pine or Gopher Snake (Pituophis spp.) at ten paces. Some species 100% require probing, other species can't be determined without medical imaging or actually breeding them, but the stuff I keep is easy.
You're welcome.