Zoe, as usual, makes some very good points, and makes them, I think, also in regard to 2nd wave feminist transsexuals who also want to express that there are a mix of both essentialist and non-essentialist povs. Same as many 2nd wave notions mix the two.
That there are some things that are eveolutionarily "essential" differences I don't think can be rationally denied. Nor can my experience that hormones do make some very profound "brain-wiring" differences also are factual.
Making that jump to "all is learned" just seems to me to be a leap across a chasm that cannot be leaped across. I agree with Zoe that given the differences there are ways that the former fear and loathing can be attenuated, abolished, in spite of the differences.
That one sex has evolved to fill the voids in the other is not a horrid thing and a gap that MUST be unbridgeable.
N~