It's a Bird, It's a Plane, It's Supersperm.
In honour of the opening of the new Superduperman movie, here's an article written 35 years ago by Larry Niven entitled, "Man of Steel, Woman of Kleenex." It's very amusing and tells what would happen should Supes mate with an ordinary human.
As an extra treat, here is Hayao Miyazaki's tribute to the Fleischer cartoons of the 40's. It's "Laputa meets Lupin". Wait for the final line, it's great.