In college I was briefly roommates with a guy with a massive penis. I know he had a massive penis because he wouldn’t stop talking about it or showing it off. He was about 6’0" and flaccid it reached down to his mid-thigh and looked like it wouldn’t fit in a Pringles container. He would walk around the apartment completely naked after a shower which is how I saw it most of the time, except once we had a party at said apartment and a couple of women asked him if the rumors were true so he got most of the women there to crowd around as he pulled down his boxers for all to see and cheer. I never actually saw it erect though, and going from his own stories it didn’t actually get him laid all that much.
He wound up moving out and shacking up with a much older woman in a nearby house, obviously in some sort of sugar mama relationship. Ironically much later I wound up dating a woman who had dated him shortly before he became my roommate. Apparently the sex was bad, not because of the size but because of climax control problems, supposedly.