Well, a good one would have a strong narrative. It might focus on the chemistry between characters in a tasteful way. For example, it could be about a budding romance where the sexual tension is part of the overall story arc, but not the only focus. The language should be elegant and not overly explicit.
Good non - vulgar sexy audio short stories often use metaphor and allusion. Instead of directly stating sexual situations, they create an atmosphere. They might describe the way a character's eyes sparkle when looking at someone they're attracted to, or the subtle blush on their cheeks. Also, a good story would have a well - developed plot that doesn't rely solely on the sexual aspect. It could be set in an interesting time or place, like a Parisian café in the 1920s, where a love story unfolds in a more sophisticated setting.
Character development is key in these types of stories. If it's a sexy audio short story, the characters should be complex and multi - dimensional. Their attraction to each other should be based on more than just physical appearance. Maybe they share a common interest in art or music, and this forms the basis of their connection. The audio presentation also matters, with a good narrator who can bring out the nuances of the story, especially the more delicate aspects related to the'sexy' elements in a tasteful manner.