An interesting editorial from Atlanta talks about the policies of the Atlanta Fulton County Public Library when it comes to adults using the children's area of the library. Apparently it's against policy for an adult to be in the children's section if they're not with a child. In an age of seeming rampant pedophilia, that makes sense, at least on the face of it.
But I think a library staff member at AFCPL said it best in the article when she explained that the policy is backwards. The library shouldn't prohibit adults without kids, rather they should prohibit kids without adults.