The most important aspect is... being hermaphroditic, or rather, the concept of gender in terms of Yin and Yang does not exist, and one can freely transform into a male or a female.
Whether it's cultivation techniques that require male or female cultivators, all of them can be practiced.
The Yin and Yang within the body maintain an optimal balance at all times, and can even evolve chaos within the body through Yin and Yang, which is indeed exceedingly strange.
"Has Mr. Song arrived?" After finishing his words, Master Huiyuan seemed to have just noticed Song He, stood up with a smile, and said, "This poor monk has disturbed your sacred place; I hope you won't take offense."
Song He responded with a smile, clasping his fists: "How could I take offense? The story shared by the master was truly enlightening for this junior, and so I boldly ask one more question, how should one cultivate to become a Celestial Being?"