In this case, the proposal comes from a professor from Brigham Young University, Cheryl B. Preston, who's proposing the idea for an Internet Community Ports Act (ICPA), which would create special "zones" online where it would be okay for "adult" material to reside, and other zones that would be kid friendly. Apparently, this is needed to:

Find a reasonable balance among the values of the First Amendment, the appeal of an unfettered technological frontier, the right to be free of unwanted speech, and the right of parents to have the aid of the government in protecting children from age-inappropriate sexually explicit content online.