people tend to look down and judge other people based on looks, like for instance two ugly people in love.
but when theyre in love, their love is as great as that of the love of beautiful people.
and their sexlife is as good, or better than the sexlife of beautiful people.
so they would not win anything, anything at all, being with someone more beautiful because the love would not be stronger and there's no telling that the sexlife would be any better.
so there's no point in going after a better looking person if there are no benefits.