Because eunuchs serve princes and nobles, they often bow down. You say it is acceptable several times a day, but eunuchs often need to salute. How can this be tolerated? Can you still knee after that? So they came up with the idea of wearing knee pads on their knees, which can reduce the damage to their knees, so powerful eunuchs will use the best materials to make knee pads for themselves. For example, Li used golden monkey skin as knee pads, which shows the importance of eunuchs.

Because of their physical defects, they got a disease called drenching urine, which will get worse with age, so they put this thing around their waist, and now it's a diaper. Do you think it's not uncomfortable to stuff your ass in hot summer?