Update README.en.md

README.en.md

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 ## Overview
 
-This repository contains a collection of 40 Chinese erotic literature datasets. Each dataset is composed of short erotic stories, personal experiences, and various other forms of explicit content. The datasets are structured in JSON format, where each file contains an array of objects, with each object representing a document:
+This repository contains a collection of 51 Chinese erotic literature datasets. Each dataset is composed of short erotic stories, personal experiences, and various other forms of explicit content. The datasets are structured in JSON format, where each file contains an array of objects, with each object representing a document:
 
 ```json
 [