“Oh, yeah, biological sex has all sorts of variations in nature.” Yizhi crawls beside me on the bamboo mat, gathering his robes away from the gray dirt beneath. “There are even creatures that can switch sex depending on their needs.” “But I thought . . .” I blink fast. “I thought females are female because their primordial qì is yīn-based, and males are male because their primordial qì is yáng-based.” Yīn and yáng represent the opposing forces that churn the universe into life.
