There should be an option to report Cyberflashing (sending nude photos without consent). The "Accept NSFW Pics" category is set to "Not At First" on my profile, but people don't always respect this. An option should be available to those people who don't respect this.

As a preventative option, how about at least show a warning within the app before sending a photo, depending on what option people have selected for "Accept NSFW Pics"?