In Exalted, having a child of any number of parents of any combination of genders is a First Circle Sorcery away.

Demon of the First Circle will let you bind a Neomah, and Neomah can take samples of flesh from any number of people, form them into an infant, cast that infant into the fire at the top of the tin tower they spin from their mouths, and have that infant take its first breath. It is the child of all contributors of flesh.

So, yes, two women can have a child in Exalted if they try hard enough. Because magic.


Spoiler: PC plots
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I had a PC once who wanted to create a breed of Dragonblooded horses. (Dragonblooded are a kind of Exalt, and are human.) He planned to use Neomah to facilitate this by selectively breeding for high-Breeding Dragonblooded parents with the finest horseflesh he could find, working to find just the right ratio of human to horse to make them look equine but have human souls with refined enough Dragonblooded bloodlines to be likely to Exalt.