there are a few ways you can tell but some must be done by a vet. 1:look at the tail and if it narrows off quik it can be a female; males will have thick ones for there reproductive organs females only have a scent gland 2
opping then requires a know how but is eccentially rubbhing their vent and pushing behind it males will have a bigger flap that protrudes but be careful this could hurt your snake 3
robing THIS MUST BE DONE BY A PROFFESIONAL!!!! using a probe to go into the vent and then measuring how much went in