As for "men becoming women", what is the difference aside from maybe one being done willingly and the other not?

I don't know what a eunuch would be in terms of "how they urinate", but if you remove a man's genitals, regardless of what you replace it with, it all boils down to the same thing: No genitals.

It's not like a man losing his genitals can still be orgasmic. Obviously they are not "women" in the biological sense. So besides being politically correct, what is the difference?

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This is a serious question btw.