That seems a stupid question, but as women and men are not equal regard to the muscle mass, what is the gender to be selected on a fat percentage balance when you're an eunuch?

As the muscles tend to diminish, do eunuch keep his original characteristics?

If I understand your question correctly, when deprived of testosterone the body distributes fat in a more female pattern. This may take a few years and and some people are more prone to it than others.

As far as muscle mass goes, testosterone helps with bulk but that doesnt mean women or eunuchs cant have large muscles.

Thanks for your answer.

As the male and female don't share the same percentage of fat, when you have an impedance balance, you must select your gender to correctly calculate your muscle and fat percentage.

For the same impedance, woman has more fat and less muscle than a man.

Formulating my question in other words, when you become an eunuch, or as your testosterone fades away, is the formula of the impedance still correct for a man, for a woman or in between?

I think that the third choice is correct, leading to a third gender that would be androgyny.