As used in this chapter, the following terms shall have the meanings indicated:
Any business otherwise permitted as a retail business or service establishment, a substantial or significant portion of which consists of selling, renting, leasing, exhibiting, displaying or otherwise dealing in materials or devices of any kind which appeal to prurient interests and which depict or describe specified sexual activities. If more than 30% of the active display area of a facility is devoted to materials or devices which depict or describe specified sexual activities or videotapes rated X or NC-17 or classified as suitable only for adults or persons 18 years of age or older or which are displayed in a portion of a facility only open to persons older than 18 years of age, it will be deemed to be a significant or substantial portion of the business.