Provide a way to mark photos as adult and hide them from the default album view. Still need a button or setting to enable "unsafe viewing". This has no effect anywhere but in the album views. They can still be viewed by flipping through the individual photos with 'prev' and 'next'. We probably need a comprehensive strategy for how to deal with n-s-f-w photos in albums so consider this a band-aid which requires additional work and integration with other facilities which access these photos. It is entirely optional.