I have added a new mature content filter setting to user settings
which will hide all lists marked as mature when browsing lists or the homepage. This setting is on
by default (and on by default to unregistered visitors). Below "Recently promoted items" on the homepage there is an note with what you have it set to.
There is a setting when editing lists to set your lists as mature content which might include lists showing excessive violence (e.g. "top 10 goriest deaths in movies") , lists of porn/adult actors/actresses/models, lists with other adult themes or containing suggestive or provocative images.
I would appreciate it if you would mark your lists appropriately (some may also be changed by me).
All lists are still visible to all by visiting the list page directly.