21.   The subject matter, however, is not to be confused with that covered in adult movie theaters, adult amusement parlors and boutiques advertising adult reading matter.

22.   The site offers reading matter and recipes, too.

23.   Their primary reading matter is ingredient lists on the sides of food packages.

24.   Who would have thought that computers communicating via the Internet would find their first big business not by replacing reading matter but by selling it?