OK so I have recently been involved in a water snake pit tagging research project, during which I learned how to probe snakes to determine their sex. I realized that I have had a carpet python for about 13 years now and have never been sure of it's gender! He/she is slightly less than 8 feet long and my question is... Is there a correct probe size/gauge which i should buy in order to do this? or does it not particularly matter? Advice would be appreciated.