In all cases, just repeating the same old lines about gender and biology. As I wrote in the comments to Jules Crittenden,
It's not what we don't know that is the problem: it's what we know that isn't so, and that we don't bother to check.
Oh yes, and another round about the need for laws to ensure equal protection in practice, not just in theory, over at Boston.com. People who have had 40 years to protest against bias crimes legislation that protect on the basis of race, creed and colour suddenly find deep philosophical objections to the concept when it protects gays and trans people too.