A story is told in New Zealand about the early 19th century visit of an Episcopal bishop to an isolated Maori village. As everyone was about to retire after an evening of high-spirited feasting and dancing, the village headman -- wanting to show sincere hospitality to his honored guest -- called out, "A woman for the bishop." Seeing a scowl of disapproval on the prelate's face, the host roared even louder, "Two women for the bishop!"
Power-as-pheromone is pretty much the default among mammals. Elk, elephant seal, baboon or chimpanzee, in a wide array of species, females eagerly mate with dominant males while disdaining subordinates. And they do so, more or less, in harems.
Not surprisingly, before the homogenization of cultures that resulted from Western colonialism, more than 85% of human societies unabashedly favored polygamy. In such societies, men who accumulate power, wealth and status gain additional wives and consorts. In avowedly monogamous cultures, successful males accumulate a wife and often additional girlfriends. Even if, thanks to birth control technology, they do not actually reproduce as a result (and thus enhance their evolutionary "fitness"), they are responding to the biological pressures that whisper within men.