"Sexually-Oriented Business" means an establishment where a substantial portion of the use is related to adult materials, visual representations, performances, or services characterized by an emphasis upon specified sexual activities or specified sexual anatomical areas, including an: adult arcade, adult bookstore, adult cabaret, adult motel, adult motion picture theater, adult-only entertainment establishment, adult theater, escort agency, nude model studio, massage parlor, sexual encounter center, or sexually-oriented spa more specifically defined hereunder by this Zoning Code.