Matt, if you don't do it right you can hurt the snake badly, you can make it hemorage. Poping is usually for neonates to juveniles, The bigger snakes tend to have a lot more muscle in the tail area which makes it nearly impossibe to pop. Probing is the most acurate way to sex an adult or sub-adult. When you pop a male you will see the hemepenes evert but a female won't have that, it takes awhile to get comfortable with it. It's not hard to do...it's all in the technique, it took Zoe about 15min and she was sexing her babies in no time and with confidence and proper technique, even after you pop it's always a good idea to get a second opinion.