** Roger Zelazny's "A Rose for Ecclesiastes" (novelette, science fiction)

Intelligent long-lived race of Mars is dying because their men have been sterilized by a curious rain. A human visitor will offer them a way out.

Collected in.

1. Robert Silverberg (Ed)'s "The Science Fiction Hall of Fame: Volume One, 1929-1964".
   

Fact sheet.

First published: F&SF, November 1963.
Rating: A

Note: Why is this post so short?