Is the top 20% of guys getting 80% of the women actually something that has been observed? If so, who are the top 20%?

How does one move into or out of the top 20%? Is there some churn (like with the richest 1% in America), and what are the requirements to get into the top 20%? If you had 10 male models in a room and put 10 women in the room with them, would there be a local top 20% there, or because these guys are already part of the wider society's top 20% they'd all do equally well?