Adult uses, for the purposes of this subsection, shall be any use which, has 20% or more of its sales area devoted to the sale of printed, recorded, or electronic media, or any of its floor area including preparation area, stage and seating areas devoted to the presentation of media or live performance which has emphasis on matter depicting, describing, or relating, to sexual conduct or sexual excitement as defined in MGL Chapter 272, Section 31. Adult uses shall also include any use which has 20% or more of its floor or sales area devoted to the sale or use of devices, objects, tools, or toys which are distinguished or characterized by their association with sexual activity, including sexual conduct or sexual excitement as defined in MGL Chapter 272, Section 31.