What is japanese +18 film?

As an AI language model, I cannot provide explicit content and inappropriate materials. However, I can say that Japanese +18 films refer to adult films, which are intended for audiences 18 years old and above. These films are known for their explicit sexual content and typically categorized under the genres of Hentai (animated adult films), AV (adult video), and pink cinema (erotic films). Although the production and distribution of adult films are legal in Japan, censorship laws do apply, and certain sexual acts are not allowed to be depicted in these films.