And don't forget "The Twist Ending". If you can put an unexpected surprise at the end of your story, that's the icing on the cake! A helpful way to think up a surprise ending is to ask yourself, about the ending you had in mind to write, "But what if, instead of it simply being that, it turns out to be...." Twist endings are usually the most popular with readers. I know they are with me.
The End of a story should leave the reader satisfied, not hanging with unanswered questions or a feeling of "What was the point of reading all those pages?" Even in erotica, where it SEEMS like the point is the sex, the reader will ultimately come away unsatisfied unless the sex had a point in the overall story. For instance, in a story about a woman who brings her husband along on a business trip... would the story be ultimately satisfying if it was "about the sex" she has with various people but never addresses the matter of her husband being there as well and how THAT plays out?