Medium-sized guy here (no horse in this race mostly) to chime in and say I have seen a lot of penises and know a lot of men.
A size-to-awesomeness ratio does not exist, but a lot of men are unnecessarily dissatisfied with their bodies. When we imply, as a society, that you can overcome perceived body deficiencies by buying bigger vehicles, it seems possible we would be encouraging the kind of behavior and city budgets we don’t want in this world.