I actually read some of "The Age Determination Guidelines issued by the Commission staff in September 2002, and any successor to such guidelines."
There are very few things that aren't potentially for children under the age of 13 based on these documents. All the sellers of clothing for the popular adult collectible Blythe dolls would have their doll clothing considered as requiring testing under the governmental definition, for one example. Any sellers of miniatures, whether intended for children or not. Games ditto, all sorts of softies and plushies, ditto. any sort of jewelry, ditto.
Basically if it is something that a child or preteen might find appealing, even if it is not "cute" it still could fall under the law