Why do most attractive girls date average/ugly guys?

I’d say 80% of the attractive girls I see are with a guy who is significantly less attractive than them.

Now at first you might say some insincere feel good bullshit like “they realize it’s what’s on the inside that counts,” but we know that most people are not that wholesome or considerate. Most people, men and women, are extremely selfish. You might then say that women don’t care about looks as much as men. Ok, I would agree but they still respond to physical attraction to a certain degree, and most of these men don’t have even a hint of it. I see some really pretty girls with some straight up ugly guys, and at best very plain and average looking. What do you think could explain such a phenomenon?