Sensitive Content Warning on iPhone is a feature that protects users from harassment or adult content by analyzing and blocking potentially sensitive photos and videos.
Users can enable this feature in the Settings app under Privacy & Security, where they can toggle on the Sensitive Content Warning and choose the apps and services to apply it to.
Once enabled, the feature will automatically blur photos and videos that may contain nudity, with options to view them by tapping 'Show' or seek help by tapping 'Alert.'
The feature currently works with Messages, AirDrop, FaceTime Messages, and Contact Posters in the Phone app, with plans to extend support to third-party apps in the future.