That's easy. Men prefer for a lifelong partner, and mother of their offspring; more demure, chaste, and virginal if at all possible women. Their ability to pair bond is strongest, and the subsequent loyalty is more likely, which prevents the man from getting cuckolded, IE dumping his resources into another mans child. It's been this way since the dawn of time. These aren't just hokey conventions. They are biological imperatives that have proven to be successful mating strategies.
Conversely women being the social creatures that they are are subject to the whims of their peers. So a man who sleeps around a lot has been judged by her peers as being a high value, or high status man. Which in turn makes her assessment of said man increase in value. If she can secure this man all her peers want, she increases her own value amongst her peers. And as for the schlub who doesn't "sleep around", or have the bona fides of a high body count; women laugh him out of the room, and call them "Incel", or some such. Because to prove to a given woman that you're worth having, her peer group has to determine you valuable as well.
Its been this way since the dawn of time. the fact that i have to explain this to you, tells us that whatever mentor figure you had growing up, failed you miserably...