I have the same concern about all my snakes, I've never popped them and haven't probed them myself either. I guess at this point for me it doesn't really matter that much now that I have 16 snakes and my collection is growing, plenty of males and females to mix things up to get some interesting babies even if a few have been sexed wrong. The more snakes you get the more you can pick and choose from a variety of animals. I'm actually planning on having a mix of about half and half males and females. I know a male can breed several females but I'd like to mix things up year after year and not be stuck with the same few males for my females.