It shall be unlawful for any person knowingly to sell or loan to a juvenile; or to display in a manner whereby juveniles can or may examine, peruse, or otherwise view; or to permit such juvenile to examine, peruse, or otherwise view; or to permit a juvenile to sell or loan to any person: Any picture, photograph, drawing, or other graphic, pictorial, or visual representation or image of a person or portion of the human body which depicts nudity, sexual conduct, sexual excitement, or sadomasochistic abuse and which is predominantly harmful or potentially harmful to juveniles.