“We have criteria that we use, and in this case we view this as pornographic material,” said Don Walker, a spokesman for the Brevard County government.

In Fond du Lac, Wis., the library did not order any copies, saying the books did not meet the standards of the community. In Georgia the Gwinnett County Public Library, near Atlanta, declined to make the books available in its 15 branches, saying that the trilogy’s graphic writing violated its no-erotica policy.

Last week a group of organizations that included the National Coalition Against Censorship formally responded, sending a letter to the library board in Brevard County scolding it for refusing to stock the book alongside standards like “Tropic of Cancer” or “Fear of Flying.”

“There is no rational basis to provide access to erotic novels like these, and at the same time exclude contemporary fiction with similar content,” the letter said. “The very act of rejecting erotica as a category suitable for public libraries sends an unmistakable message of condemnation that is moralistic in tone, and totally inappropriate in a public institution dedicated to serving the needs and interests of all members of the community.”

Joan Bertin, the executive director of the National Coalition Against Censorship, said in an interview that it was unusual for a library to remove a book from its section for adults.

“The vast majority of cases that we deal with have to do with removing books to keep kids from seeing them,” she said. “That’s what makes this so egregious. There are some possible arguments for trying to keep kids away from certain kinds of content, but in the case of adults, other than the restrictions on obscenity and child pornography, there’s simply no excuse. This is really very much against the norms in the profession.”

Vintage, which is part of Random House, said in a statement, “Random House fervently opposes literary censorship and supports the First Amendment rights of readers to make their own reading choices. We believe the Brevard County Public Library System is indulging in an act of censorship, and essentially is saying to library patrons: We will judge what you can read.”