An outside company takes care of our magazine rack. Supermarkets can and do control what materials are sold in their store. Just as a store would not place Igloo Today in a Florida store, it should not place adult material in an area frequented by children. My hands are tied. See Taking Out the Trash .
Parents can control what their children see on television.
In the checkout aisle, there are no buttons to turn off, no parental controls. The only option available is to shop elsewhere. You can use those. Those aisles are not marked or may have longer lines. One of the selling points for supermarkets is convenience.