There are quite a lot of places where you can find porn videos that try to have a story behind it, however, most of them are quite cheesy, and they do not compare to the real thing at all. In case you want to read hundreds of true sex stories, then you should definitely visit reddit.com/r/gonewildstories/.
All of the stories you find here are true experiences of the registered users themselves, and you will definitely enjoy most of them. The subreddit has a very nice system when it comes to tagging, so you can easily find a sex story that you would like to read. In case you do not feel like browsing through the stories of ‘lower’ qualities, it is advised that you stick to the ‘hot’ page where you can only find sex stories that have received a big number of upvotes from the community.