Another sort of selection: arranged marriages. I assume they select for something, even if it's mostly status.

Status, yeah, but the details would probably vary with how they're done. In particular, it seems like there'd be some interesting sex-linked differences; systems like the old European one where brides come with a dowry and grooms come with lands and titles imply distinctly different correlates of mate quality by gender, and over enough time we might expect to see this reflected in sex differentiation. I'm not sure if any civilizations have been stable long enough for this to actually come up in practice, though.