According to biologists, the average human male actually has a large phallus, at least in comparison with some of our closest living relatives.
Professor Underdown stated that the evolution of larger penises in humans is almost certainly related to our bipedalism, which complicates reproduction.
The selective pressure to walk on two legs was massive and sustained for millions of years, affecting not just how we moved but also biological characteristics.
Humans began evolving to walk bipedally to adapt to their environment, which included using and carrying tools, and intimidating potential predators.
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