While equality is a social good we all strive for, in the bedroom (or wherever you do it) playing with power dynamics makes for much more interesting fantasies…and realities.
And so we find fantasies about spanking, strong alpha males, werewolves, dominatrixes, BDSM, Daddies, etc… all play on feelings around authority and often use role reversal by bringing desire into a space where there is often fear.