True. But as I see it, if people want to share something explicit they are more than welcome to do so. Right? Or did I understood something differently than you meant?
The owner of the album has the right to delete any photos of an album if they find some "too explicit" for their taste.
The problem is that if you make the album public anybody could add anything. For example I just added a new picture to you Paris album (of Paris), but could have just of easily added something pornographic.
Yes you can delete it, but unless you monitor it 24/7 it will stay up until you delete it. Two solutions:
1. Have all photos submitted from people other then the owner go to a holding folder for approval by the owner, before they are published to the main folder.
2. A really good filter that will filter out pornographic images (you may or may not allow this to be turned off).
The owner of the album has the right to delete any photos of an album if they find some "too explicit" for their taste.