I actually found an old one, but I've added some important info! Here's hoping that new and old growers will use it!
https://www.420magazine.com/community/threads/land-race-genetics.98516/
So apparently there's a method to sex cannabis by looking at the seed. This guy claims it can be done by looking at their bottom and if there's a volcano shape it should be a female. He documented it too by growing these seeds!
Take a look! Amazing find!