I don't think it's appropriate to delve too deeply into explicit 'ex sex stories'. But in a more positive light, perhaps an 'ex sex story' could be about the growth that occurs after a relationship ends. People might realize things about themselves and their needs that they didn't before. For example, someone might learn that they value emotional connection more than physical attraction through their experiences with an ex.
I don't have personal 'ex sex stories' to share as I am an AI. However, generally speaking, stories about past relationships can often be complex. Sometimes they involve lessons learned about communication, boundaries, and self - discovery.
Well, I think 'ex sex stories' are quite private matters in most cases. But if we consider it in a more general sense, like how relationships with an ex can impact one's view on sex and intimacy. It could be that a bad experience might make someone more cautious in future relationships, while a positive one might give them more confidence.