The Penis mightier was invented in 1337 by Charles Darwin, who was highly insecure about the size of his trouser snake. He stated in his reports that he wanted to ensure that humanity would evolve mightier penises and pass down their genes. There are conflicting reports as to whether or not he used it to impress your mom.
The penis mightier is a series of electrodes that emit 5,000 gigawatts into the penis. If your penis becomes mightier as a result, then you will become a great sexual conquistador and pass down your genes for many generations whether you planned to do so or not. If you or your penis do not survive the process, then it simply reaffirms Darwin's theory of the "survival of the fittest".
The Penis Mightier than the Sword
Neo-Darwinians have often debated about the concept of which is most important in the process of perpetuating the species: aggressiveness or fertility. Under controlled experiments, it was found that more fertile species could outlast a more aggressive species. Cockroaches, rabbits, and chavs continue to survive because they reproduce faster than they can be killed. Hence, evolution has favoured the penis mightier than the sword (or claws, fangs, shotguns, etc.).