I think a matriarchy setting needs women to have some power over men that isn't easily ignored or balanced out. At minimum they need to be as strong as men and slightly more likely than men to commit sexual assault, kidnapping, or forced marriage (that they are likely to get away with). Just having less-enforced social norms be flipped in a setting where women and men are equally prone to aggression and expressing horniness in the same ways would count.
Monster Girl Encyclopedia and Monster Girl Quest having men be susceptible to nutting so hard it renders them mindbroken and submissive to whichever girl fucked them made for excellent femdom stories (though Encyclopedia never really went all in with it, imo)