Looks bottleneck is the idea that men did not develop to attract women with looks, because the majority of fertile young women are more physically attractive than the majority of men their same age.
According to sexual dimorphism and Darwinian ideas in that realm, looks are important to all mammals, to demonstrate physical health and hunting prowess (like sheer size). This probably does not apply to human males since for the better part of history females did not have any choice when it comes to mating or marriage, therefore sexual dimorphism did not probably develop amongst human males.
Hunting or Fighting
There is a notion that the vast majority of males throughout history were hunters, builders, or farmers. This is not true. Fighting and Hunting became a niche right at the peak of the earliest civilizations. Most men did not hunt because of agriculture and animal husbandry. Human males became highly specialized and versatile as time went on. The need for extremely large males with fighting skills was almost never in high demand. This is contrary to what evolutionary psychologists spout when it comes to how a man should be.
Lookism as a new commodity
Women are sexually attracted to good looks, and this evolutionary, "bug", created a thunderstorm of problems for men worldwide. If we can establish that men did not evolve to impress, hunt, or fight, then it's obvious that most men are born with unique talents and traits that can be used in society in different ways.
However, because looks is the prime catalyst of attraction in males, we might see changes implemented on a political level, as birthrates fail to meet the basic replacement rate.