trwnh.com/unified.test.hugo/content/kb/activitypub/extensions/as2-unofficial/sensitive.md

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boolean. if true, indicates that the information contained within the object (content, etc) is considered "sensitive", in the sense that viewer discretion may be advised, e.g. "NSFW" material.

when encountered, usually the assumption is that the object's content will be hidden or collapsed behind a warning of some sort. in mastodon, the summary will be used as the text of the warning, and the content will be hidden below it; furthermore, anything in attachment will be hidden behind a sensitive content click-through instead of being directly previewable.