Sexing Via Flashlight

So I came across this method of sexing via flashlight. I was just curious if anyone else has had success with this method, and if you have, what is the youngest beardie that you have used this method on?
http://s16.postimg.org/meydybu11/s2_OIALb.jpg

That's pretty slick!

Too bad that won't work with our snakes.

I used this on my young Leo


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I read a thread on a gecko forum about doing this with leos.

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I actually did this on my two beardies and got male/female. It takes a powerful flashlight for sure. So I had someone check my beardies for me and they concurred with my findings. It works!