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[Aussie Python Lover]

Sex can be determined in snakes by probing posterior to the cloaca, to determine the presence of hemipenes. Typical sexing probes are stainless steel and either ball-tipped or tapered on the end. A safer method of sexing juvenile snakes is the "popping" of the male hemipenes. The animal is held inverted in the left hand, with gentle finger pressure just forward of the cloaca. The ball of the right thumb is placed on the tail, about twenty scales behind the cloaca. The right thumb is then rolled forward toward the cloaca. This pressure on the tail will cause the hemipenes of the male snake to be everted. Hope that helps