Specifically, the part of their culture where all women are considered property.
But... not really? Because owning a woman doesn't mean you own her body or possessions, she gets a share every time she gets sold, and they all seem to have a scary reputation considering they are "property."
It's just very bizarre. It's like having a servant, except that dynamic doesn't really work. It's definitely not like having a slave. You could consider it like dating, maybe?
Actually, all the Western Angaraks have weird attitudes towards their women. Thull women are basically nymphomaniac baby machines (since a pregnant woman can't be sacrificed). Murgo women are kept under lock and key by their families, to make them obedient and promote racial purity. Nadraks have the very strange "ownership" dynamic.