I've always thought the keyword is "explicit" for which the most relevant definition is probably: "described or shown in realistic detail" I had the iKarmasutr

I've always thought the keyword is "explicit" for which the most relevant definition is probably: "described or shown in realistic detail" I had the iKarmasutra app and it was great; slightly coy and fun, but detailed enough to understand how each position worked. The images were tastefully drawn with the same emphasis. But the detail couldn't be described as "realistic" I don't think you even need to argue the historical/educational angle.