The most likely situation is that you have a female and that you tore the anal gland on one side with the probe, allowing the probe to go in deeper on that side. This is not that uncommon.



I agree with the previous reply that you cannot "pop" snakes much older than a few days. Their retractor muscles become strong enough to resist being popped.



With kingsnakes, I find that it is often easy to sex adults by the shape of the tail. Males have a "muscular" tail that is broad at the vent and stays that way for a while before tapering off. Female's tails will often widen immediately posterior to the vent, but taper off very quickly. The male's tail looks thick and muscular while the female's tail often looks there is some sort of inflammation just posterior to the vent.



Here is a diagram of what I am talking about. getula are usually easy to sex as adults this way -






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Chris Harrison

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