A. It is unlawful for any person, offering for sale in a retail establishment open to the general public any book, magazine or other printed material the cover of which depicts nudity, sado-masochistic [sadomasochistic] abuse, sexual conduct or sexual excitement and which is harmful to minors, to knowingly exhibit that book, magazine or material in that establishment in such a way that it is on open display to, or within the convenient reach of, minors who may frequent the retail establishment. Such books, magazines or printed materials may be displayed behind an opaque covering which conceals the depiction of nudity, sado-masochistic [sadomasochistic] abuse, sexual conduct or sexual excitement, provided that those books, magazines or printed materials are not within the convenient reach of minors who may frequent the retail establishment.
B. It is unlawful for any person, offering for sale in a retail establishment open to the general public any book, magazine or other printed material the content of which exploits, is devoted to or is principally made up of descriptions or depictions of nudity, sado-masochistic [sadomasochistic] abuse, sexual conduct or sexual excitement and which are harmful to minors, to knowingly exhibit that book, magazine or material in that establishment in such a way that it is within the convenient reach of minors who may frequent the retail establishment.