Unfortunately, blue tongues are extremely difficult to sex. There are some minor differences in things like head shape and body shape, but those are not always evident. The only way to confirm a skink as a gender without watching it breeding is by seeing sperm plugs or seeing the hemipenes when the skink is defecating. Due to this, the general consensus for sexing skinks is by observing their behavior when you put them together. I do have some evidence for one of them being a male due to what I think are sperm plugs and my sister saying she saw hemipenes once. That same skink also acted very territorial. However, I have no idea what sex other skink is. The only confirmed way to prove a female blue tongue skink is by it producing offspring.
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