A client with NSFW tagging and content filtering is Damus.Other clients have content warnings such as Mastodon.Many Japanese NSFW artists think that they only want to show their NSFW art to the people they want to see it.Therefore, just putting NSFW tags is not enough.The Japanese have a terrible aversion to causing trouble for others, and Nostr has a different set of values from those in other countries, where people can say they are most free to post NSFW art.