Renewing the eunuch's bird,
is a technical task,
different from reattaching your severed finger, which is actually simpler.
It is said that during the Xia Dynasty, there was no standardized procedure for the castration of eunuchs, leading to the inclusion of those with congenital underdevelopment as eunuchs in the palace. Some were inadequately castrated, such as only cutting off a testicle.
These people, after becoming eunuchs and entering the palace, might have been well-nourished or encountered some unique opportunities, such as practicing martial arts or cultivating Qi refining methods, giving their bodies a chance for near "secondary development." Some eunuchs were surprised to find that they seemed barely capable of intimacy, or while unable to perform the acts, they could somehow achieve the results.
The most famous inner palace chaos during the Xia Dynasty, which reportedly affected the pure bloodline of the Royal Family, began with this as a precursor.
