Desert x desert

[Anatopism]

Its a risky pairing. People already don't want to invest in a female that is infertile. If a female desert can only produce a viable clutch if only paired with a male desert seems almost pointless or at least a dead end.

Also, the infertility is probably directly linked to the X chromosome, which is why male deserts are fine.

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Most snakes use ZZ:ZW sex determination, right? - http://en.wikipedia.org/wiki/ZW_sex-...ination_system
Desert female infertility perhaps is linked to W, similar to male patterned baldness in humans?