I am not sure that really counts, since the husband still takes care (and sometimes has sex) with her, meaning that the rest of his activities are not that important from an evolution point of view.
She is not even "just another part of harem". She is his wife. She is alpha, making her in essence wayyy too far from a cuck.
@LukeAlmighty @alyx Go be a retard somewhere else.
@LukeAlmighty @alyx A cuck is someone that gets sexual pleasure out of their significant other fucking other people. It's not that deep man.