"Superman" was a real character in Cuba. He was hugely endowed, and performed prodigious sex acts nightly in a club in Havana. One of the guys I worked with years ago lived in Miami and played in his high school band. As a reward, the school took the graduating band members for a weekend in pre-Castro Havana. My co-worker said that, at ever streetcorner, some character approached them with flyers for one sex club or another, whispering, "Just like Superman."