In addition to the other good info you've gotten, I stumbled across this site back when I was trying to figure out probing and finding descriptions of the internal structure to be a bit too vague. One drawing pretty well cleared everything up.

www.corn-utopia.com/Corn Utopia on the Web/Sexing Snakes With Probes.htm

A few other notes:

Hold the probe gently with your fingertips and do not let the end of it rest against your hand. This helps reduce the risk of impaling the snake if it jerks. If you think you need a firm grip on the probe, you're doing something wrong...

Rotating the probe gently while inserting helps overcome any clinching by the snake without having to push harder.

When the probe seems to bottom out, going slightly in and out a few times while rotating will clear up many "false female" results.
-----
What goes up must come down...unless it exceeds escape velocity.

[ Show Entire Thread ]