Since the title is rather ambiguous, if it's a fictional story about something being 'too big' in a non - sexual sense, perhaps we can learn about the concept of excess or the challenges that come with dealing with something oversized. But again, it depends on the actual story.
I'm not sure what specific 'too big sex story' you are referring to. It could be a very unique or personal account. Without more context, it's difficult to say what can be learned from it.