The verdict is still out about that in the scientific community as far as I'm aware, though it's definitely notable that studies have shown that homosexuals tend to have a hypothalamus approximately half the size of that of a heterosexual.
Liberals > Conservatives, and yes, conservatives (see: the Bible belt and the south and mid west in general) do tend to be more uneducated than liberals, the main exception being the poor urban population generally siding with liberals. However, on ideological grounds, there is a correlation between education level and liberal ideology. Also, don't fucking associate political correctness directly with liberalism because both ideologies are equally victims.