We don't know too much about the setting. A man and his wife are both working in some sort of mine when an explosion kills the lights and temporarily destroys the man's hearing. As he searches for his wife in the dark, he talks to keep up his spirits in this disorienting crisis.
What does he talk about? Duh, sex. His narration as he gropes around for his wife, not knowing if she can hear him, or even if she's alive, are vivid, hot, and affectionate, while managing to sound like natural dialogue, a very impressive accomplishment. Further, Ray manages to keep the sexual tension and the narrative tension simultaneously high.
The ending is a bit of a let-down--it doesn't show the level of attention and outstanding craftmanship the rest of the story does. But if you want to see a masterpiece of balance between narrative, character, and sex, you can't afford to miss this story.