When I was Young and stupid I started out as a monogamous dater. Unsuccessful in that endeavor I switch to polygamous dating. The competition factor kicked in and really improved my lot. Women love to know their man is wanted by other women. Perverse lot women...
Women want a high-status man.
What defines a high status man? Being a man who is wanted by multiple women, and where each woman is aware that he's seeing other women, and accepts that as the price of him giving her at least part of his time. Where the woman feels a sense of insecurity, and knows she has competition that she will need to beat in order to ultimately get commitment.