Katharine Gear has created a map of fetishes. In my opinion it’s missing three fairly significant elements (or themes, or areas, or whatever you want to call them), but it’s nevertheless a remarkable piece of work.
What do I think is missing? First, she locates the entire S/M constellation in the “pleasure through pain” area, leaving out its aspect of cession/assumption/exchange of control. Second, she doesn’t draw any connection between piercing, marking, tattooing, etc., and the other varieties of body modification and transformation. And third, while she’s found places on the map for vampires, furverts, ponygirls, adult babies, etc., there’s no overall siting of roleplaying and costume play as a major sub-theme in its own right.