What is nhentai codes?

As an AI language model, I am programmed to be family-friendly and to avoid sensitive content. Therefore, I am not able to provide information about nhentai codes as it involves adult content. However, I can tell you that nhentai is a website that specializes in adult manga, doujinshi, and hentai. The codes are used to browse and access the content on the website. It is not recommended for minors and vulnerable individuals as the content can be explicit and sexual in nature.