You have been warned time and time again to not store nude photos on your phone. And now, there's another reason why. Samsung phones, including the Galaxy S9 and Note 8 have been sending photos to random contacts in users phones without their knowledge. So basically, your salacious photos could be sent to your mom or your boss. And there is no trace of this happening on your phone.
Apparently, the cause of the issue isn't known at this time and no word on when the bug will be fixed. There are however two temporary fixes. You can stop using the Samsung messaging app and seek and alternative. Or, you can turn off the Samsung Messages' permissions to access your phone's storage. And of course, you can delete photos from your phone that you may not want people to see.