Be nice, now. You yourself said things like - without paying any attention whatsoever to sexual selection. The theory that humans will evolve to lose their sexual dimorphism is not well supported, since in many places people appear to have been effectively "bred" by sexual selection to fit a cultural ideal. Also, your idea about "more advanced" species is a mite questionable in an evolutionary context. Speaking of sexual selection... most sexual selection in birds acts on the male, which produces the flamboyant and (in some cases) deleterious traits in male birds which the females often do not have. This means that mate selection is being made by females and not males. So... since the old assumption that the male bird was "superior" to the female comes from an examination of their fine plumage et cetera... maybe the whole inherited concept of gender superiority is a little bit flawed.