Try the flash light. Get a powerful flash light, hold the leo upside down, & shine the light through its belly, if you see veins, most likely a male, nothing maybe female.
Krow actually there is more to that method lol XD
If you hold the gecko upside down and shine the light through the base of the tail and see three veins its a boy, one big on in the middle it's a girl
but males can be hard to tell this way if stressed
anyways it is too blurry to tell but super cute leo!!