well
There is no other choice. Looking at the vent is not 100% accurate and popping can only be done in certain situations. So regardless of how you think the snake might feel about, it has to be done.
Don't worry, a probe is not like the equivilent of a lantern pole. lol
Its a very very slim instrument which goes in a very shallow depth. An actual mating would be more intrusive I think.
bmm