Math ... porn??
https://www.dictionary.com/e/is-that-food-really-porn-and-should-you-even-say-that/
“Even when porn isn’t being used to describe sexually explicit content, it still refers to content that people look at or interact with to satisfy a desire. It also still generally refers to content that is beyond what’s readily accessible in day to day life—gold-covered ice cream, for example, or meticulously laid-out cheese boards.”